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401. Alfalfa (Forage), Harvested Area Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for alfalfa forage crops in tons per hectare. Croplands cover ~15 million km2 of the planet and pr... University of Minnesota. Institute on the Environment.

402. Alfalfa (Forage), Harvested Area (Fractional), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average fractional proportion of a gridcell for alfalfa forage crops that were harvested circa 2000. Croplands cove... University of Minnesota. Institute on the Environment.

403. Alfalfa (Forage), Harvested Area (Hectares), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average number of hectares per land-area of a gridcell for alfalfa forage crops. Data quality categories include (0... University of Minnesota. Institute on the Environment.

404. Alfalfa, Total Forage Crop Production, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents total alfalfa forage crop production in metric tons. Harvested area in hectares was multiplied by yield per hectare ... University of Minnesota. Institute on the Environment.

405. Alluvial contacts (Units): Albion River Watershed, California, 2000

2000. California Geological Survey. This polygon shapefile depicts alluvial contacts in the Albion Watershed region of Mendocino County, California. Alluvail contacts are unconsolidat... California Geological Survey.

406. Alma Street, Palo Alto, 2017

2017. Jasper Ridge Biological Preserve (Agency). This line shapefile represents a portion of Alma Street in Palo Alto, California. This layer is part of a collection of GIS data created and manage... Jasper Ridge Biological Preserve (Agency).

407. Almond, Average Yield, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for almond crops in tons per hectare. Croplands cover ~15 million km2 of the planet and provide th... University of Minnesota. Institute on the Environment.

408. Almond, Crop Yield Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for almond crop yields. Data quality categories include (0= missing, 0.25= coun... University of Minnesota. Institute on the Environment.

409. Almond, Harvested Area Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for harvested areas of almond crops. Data quality categories include (0= missin... University of Minnesota. Institute on the Environment.

410. Almond, Harvested Area (Fractional), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average fractional proportion of a gridcell for almond crops that were harvested circa 2000. Croplands cover ~15 mi... University of Minnesota. Institute on the Environment.

411. Almond, Harvested Area (Hectares), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average number of hectares per land-area of a gridcell for almond crops. Data quality categories include (0= missin... University of Minnesota. Institute on the Environment.

412. Almond, Total Crop Production, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents total almond crop production in metric tons. Harvested area in hectares was multiplied by yield per hectare to creat... University of Minnesota. Institute on the Environment.

413. Alquist Priolo Fault Lines, Monterey County, California, 2015

2015. Monterey County (Calif.). This line shapefile depicts the Alquist Priolo faults within Monterey County, California. These data were created using TIFF images accessed throug... Monterey County (Calif.).

414. Alquist Priolo Fault Zones, Monterey County, California, 2015

2015. Monterey County (Calif.). This polygon shapefile contains the Alquist-Priolo Earthquake Fault zones and fault traces as shown on the Official Alquist-Priolo Earthquake Fault... Monterey County (Calif.).

415. Alternative Fuels: United States, 2013

2013. Hudgins, Andrew and United States. Bureau of Transportation Statistics. This point shapefile depicts fueling facilities that offer fuels other than gasoline in the United States. Through a nationwide network of local co... United States. Bureau of Transportation Statistics.

416. Amphibian and Reptile Specimen Provenances: San Francisco Bay Area, California, 2011

2011. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). The University of California, Berkeley Museum of Vertebrate Zoology (MVZ) collection of amphibians and reptiles contains over 265,000 catalogued sp... Bay Area Open Space Council.

417. Amtrak Bus Stations, California, 2013

2013. California. Department of Transportation. This point shapefile contains locations of Amtrak thruway bus stations in California. The bus system operates in conjunction with the three Amtrak ... California. Department of Transportation.

418. Amtrak Stations: United States and Canada, 2010

2010. Hunt, Raquel and United States. Bureau of Transportation Statistics. This point shapefile depicts Amtrak inter-city railroad passenger terminals in the United States and Canada. Attribute data include services and pa... United States. Bureau of Transportation Statistics.

419. Amtrak Thruway Bus System, California, 2013

2013. California. Department of Transportation. This line shapefile represents the Amtrak thruway bus system in California. These buses operate in conjunction with the three Amtrak (Capitol Corri... California. Department of Transportation.

420. Anchorages, Northeast United States, 2013

2013. Baldwin Group. This polygon shapefile represents anchorages in the Northeastern United States. The areas described are designated as special anchorage areas for p... Coastal Services Center (U.S.).

421. Ancient Africa or Libya, Part I (western section) (Raster Image)

1840. Stanford Geospatial Center and J. & C. Walker (Firm). This layer is a georeferenced raster image of an historic regional map of Nothern Africa from 1840. The original map was engraved by J. & C. Wa... Stanford Digital Repository.

422. Ancient, Medieval, and Modern Walls, Paris, 308-1970

308. Gherdevich, Davide, Noizet, Hélène, Faucherre, Nicolas, 1957-, and Bethe, Anne-Laure. This polygon shapefile represents walls erected in the city of Paris, France, starting from the Roman Era until the 18th century (308-1970). This l... Analyse Diachronique de l'espace Urbain Parisien: Approche Geomatique.

424. Anise and Fennel, Average Yield, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for anise and fennel crops in tons per hectare. Croplands cover ~15 million km2 of the planet and ... University of Minnesota. Institute on the Environment.

425. Anise and Fennel, Crop Yield Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for anise and fennel crop yields. Data quality categories include (0= missing, ... University of Minnesota. Institute on the Environment.

426. Anise and Fennel, Harvested Area Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for harvested areas of anise and fennel crops. Data quality categories include ... University of Minnesota. Institute on the Environment.

427. Anise and Fennel, Harvested Area (Fractional), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average fractional proportion of a gridcell for anise and fennel crops that were harvested circa 2000. Croplands co... University of Minnesota. Institute on the Environment.

428. Anise and Fennel, Harvested Area (Hectares), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average number of hectares per land-area of a gridcell for anise and fennel crops. Data quality categories include ... University of Minnesota. Institute on the Environment.

429. Anise and Fennel, Total Crop Production, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents total anise and fennel crop production in metric tons. Harvested area in hectares was multiplied by yield per hectar... University of Minnesota. Institute on the Environment.

430. Annexations, San Joaquin County, California, 2015

2015. San Joaquin County (Calif.). Community Development Department. This polygon shapefile contains annexations in San Joaquin County, California. Annexation is a process by which a municipality expands its boundari... San Joaquin County (Calif.). Community Development Department.

431. Annual Growth of Biomass for Vegetation Outside of Croplands: Kenya, 2002

2002. This polygon shapefile depicts the annual growth of biomass outside of croplands as well as the theoretically harvestable biomass yield outside of ... World Resources Institute.

432. Annual Particulate Matter (Annual PM-2.5) Non-Attainment Designations in Region 9, 2011

2011. United States. Environmental Protection Agency, Region IX. This polygon shapefile contains designated areas for particulate matter < 2.5 microns, according to the annual National Ambient Air Quality Stan... United States. Environmental Protection Agency, Region IX.

433. Annual Precipitation: San Francisco Bay Area, California, 2005

2005. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). This raster dataset depicts the annual precipitation by averaging monthly precipitation within the nine county San Francisco Bay Area Region, Calif... Bay Area Open Space Council.

434. Annual Projected Water Balance by Subdrainage Area in Kenya, 2000 and 2010

2000. World Resources Institute. This polygon shapefile portrays annual projected water balance by subdrainage area in Kenya for 2000 and 2010. The data was taken from the Kenya Na... World Resources Institute.

435. Antarctic Claim Limit Areas, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyon shapefile contains boundaries for territorial claims made by Argentina, Australia, Brazil, Chile, France, Germany, Great Britain, Norwa... North American Cartographic Information Society.

436. Antarctic Claim Limit Lines, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This line shapefile contains the limit lines for territorial land claims made on the continent of Antarctica. These data are represented at 1:10,00... North American Cartographic Information Society.

437. Antarctic Ice Shelf Areas, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts year-round ice shelves in Antarctica. Data was derived from the MODIS 2003-2004 Mosaic of Antarctica, but reflects m... North American Cartographic Information Society.

438. Antarctic Ice Shelf Areas, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts the edges of year-round ice shelves fringing Antarctica. Data was generalized from 10m Antarctic ice shelves derived... North American Cartographic Information Society.

439. Antarctic Ice Shelf Edges, 1:10 million (2012)

0. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile depicts the edges of year-round ice shelves fringing Antarctica. Data was derived from the MODIS 2003-2004 Mosaic of Antarc... North American Cartographic Information Society.

440. Antarctic Ice Shelf Edges, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile depicts the edges of year-round ice shelves fringing Antarctica. Data was generalized from 10m Antarctic ice shelves derive... North American Cartographic Information Society.

441. Apples, Average Yield, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for apple crops in tons per hectare. Croplands cover ~15 million km2 of the planet and provide the... University of Minnesota. Institute on the Environment.

442. Apples, Crop Yield Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for apple crop yields. Data quality categories include (0= missing, 0.25= count... University of Minnesota. Institute on the Environment.

443. Apples, Harvested Area Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for harvested areas of apple crops. Data quality categories include (0= missing... University of Minnesota. Institute on the Environment.

444. Apples, Harvested Area (Fractional), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average fractional proportion of a gridcell for apple crops that were harvested circa 2000. Croplands cover ~15 mil... University of Minnesota. Institute on the Environment.

445. Apples, Harvested Area (Hectares), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average number of hectares per land-area of a gridcell for apple crops. Data quality categories include (0= missing... University of Minnesota. Institute on the Environment.

446. Apples, Total Crop Production, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents total apple crop production in metric tons. Harvested area in hectares was multiplied by yield per hectare to create... University of Minnesota. Institute on the Environment.

447. Apricots, Average Yield, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for apricot crops in tons per hectare. Croplands cover ~15 million km2 of the planet and provide t... University of Minnesota. Institute on the Environment.

448. Apricots, Crop Yield Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for apricot crop yields. Data quality categories include (0= missing, 0.25= cou... University of Minnesota. Institute on the Environment.

449. Apricots, Harvested Area Data Quality, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for harvested areas of apricot crops. Data quality categories include (0= missi... University of Minnesota. Institute on the Environment.

450. Apricots, Harvested Area (Fractional), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average fractional proportion of a gridcell for apricot crops that were harvested circa 2000. Croplands cover ~15 m... University of Minnesota. Institute on the Environment.

451. Apricots, Harvested Area (Hectares), 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset depicts the average number of hectares per land-area of a gridcell for apricot crops. Data quality categories include (0= missi... University of Minnesota. Institute on the Environment.

452. Apricots, Total Crop Production, 2000

2000. University of Minnesota. Institute on the Environment. This raster dataset represents total apricot crop production in metric tons. Harvested area in hectares was multiplied by yield per hectare to crea... University of Minnesota. Institute on the Environment.

453. Aquaculture Leases: California, 2011

2011. California. Department of Fish and Game. Marine Resources Region and California Department of Fish and Wildlife Aquaculture and Bay Management . This polygon shapefile depicts the location and extent of aquaculture leases in California. The purpose of operation, species and approved cultivat... California. Department of Fish and Game. Marine Resources Region.

454. Aquaculture, Northeast United States, 2014

2013. SeaPlan. This polygon shapefile represents aquaculture regions in the northeastern United States. Aquaculture in the northeast region is a diverse, vibrant ... Northeast Ocean Data.

455. Aqueducts, Algeria, 2009

2009. International Steering Committee for Global Mapping and YaʼItyoṗyā kārtā śerā derejet. This line shapefile represents aqueducts and canals in Algeria. These data are part of GlobalMap Algeria version 2.Global Map data were developed u... International Steering Committee for Global Mapping.

456. Aqueducts and Canals, Albania, 2016

2016. International Steering Committee for Global Mapping and Albania. State Authority for Geospatial Information. This line shapefile represents aqueducts and canals in Albania. The Global Map Albania version 2 was developed based on Global Map Specifications ... International Steering Committee for Global Mapping.

457. Aqueducts and Canals, Azerbaijan, 2012

2012. International Steering Committee for Global Mapping and Azerbaijan. State Committee Land and Cartography. This line shapefile represents aqueducts and canals in Azerbaijan. This layer is part of Global Map version 2. The Global Map Azerbaijan version 2 ... International Steering Committee for Global Mapping.

458. Aqueducts and Canals, Cuba, 2016

2016. International Steering Committee for Global Mapping and Oficional Nacional de Hidrografia y Geodesia (ONHG). This line shapefile represents aqueducts and canals in Cuba. Data for Global Map Cuba were transformed from Digital Topographical Map 1:250 000 of... International Steering Committee for Global Mapping.

459. Aqueducts and Canals, Georgia, 2013

2013. International Steering Committee for Global Mapping and Georgia. National Agency for Public Registry. This line shapefile represents aqueducts and canals in Georgia. The Global Map Georgia version 2 was developed from the 2008 Year, data - 1:1 000 ... International Steering Committee for Global Mapping.

460. Aqueducts and Canals, India, 2016

2016. International Steering Committee for Global Mapping and Survey of India. This line shapefile represents aqueducts and canals in India. This layer is part of Global Map version 2.Global Map data were developed under the c... International Steering Committee for Global Mapping.

461. Aqueducts and Canals, Jordan, 2012

2012. International Steering Committee for Global Mapping and Sāzmān-i Naqshahʹbardārī-i Kishvar. This line shapefile represents aqueducts and canals in Jordan. The Global Map Jordan version 1 was developed from Tourist Map of Jordan 2005 at 1:7... International Steering Committee for Global Mapping.

462. Aqueducts and Canals, New Zealand, 2014

2014. International Steering Committee for Global Mapping and New Zealand. National Topographic/Hydrographic Authority. This polygon shapefile represents aqueducts and canals in New Zealand. The Global Map New Zealand version 2 airport and road were developed from t... International Steering Committee for Global Mapping.

463. Aqueducts and Canals, Serbia, 2013

2013. International Steering Committee for Global Mapping and Republic Geodetic Authority (Serbia). This line shapefile represents aqueducts and canals in Serbia. Boundaries of administrative units are collected from different sources (cadastral ... International Steering Committee for Global Mapping.

464. Aqueducts and Canals, Vietnam, 2016

2016. International Steering Committee for Global Mapping and Vietnam. Bộ tài nguyên và môi trường. This line shapefile represents aqueducts and canals in Vietnam. This layer is part of Global Map version 2. Updating the transportation data of ver... International Steering Committee for Global Mapping.

465. Arabia with Egypt, Nubia and Abyssinia. J. & C. Walker sculpt. Published by the Society for the Diffusion of Useful Knowledge, 42 Bedford Sqre. Octr. 15th. 1843. (London Chapman & Hall, 1844) (Raster Image)

1843. Rumsey, David, 1944- and Society for the Diffusion of Useful Knowledge (Great Britain). This layer is a georeferenced image of a map of Egypt and Arabia, originally created by the Society for the Diffusion of Useful Knowledge in 1843. ... Cartography Associates.

466. Arastradero Road, Palo Alto, 2017

2017. Jasper Ridge Biological Preserve (Agency). This line shapefile represents a portion of Arastradero Road in Palo Alto, California. This layer is part of a collection of GIS data created and m... Jasper Ridge Biological Preserve (Agency).

467. Arcata and Mad River Transit Routes: Humboldt County, California, 2015

2015. von Dohlen, Jerry. This polyline shapefile depicts centerlines for the Arcata and Mad River Transit System Red and Gold Routes in the County of Humboldt, California. ... Humboldt County Planning and Building Department.

468. Archaeological Sensitivity, Monterey County, California, 2015

2015. Monterey County (Calif.). This polygon shapefile contains areas of archaeological sensitivity within Monterey County, California. Archaeological sensitivity zones are those ... Monterey County (Calif.).

469. Archeological Reports: Santa Cruz County, California, 2015

2015. Garcia, Paul and Price, Matt. This point shapefile depicts locations of archaeological reports submitted with land use applications in the County of Santa Cruz, California. Sant... County of Santa Cruz Information Services Department.

470. Arctic Ice Chart, April 1, 1966

1966. Arctic Climate System (ACSYS). This line shapefile contains ice observations in the Arctic region for April 1, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).

471. Arctic Ice Chart, April 1, 1967

1967. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1967. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

472. Arctic Ice Chart, April 1, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

473. Arctic Ice Chart, April 1, 1970

1970. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1970. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

474. Arctic Ice Chart, April 1, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1971. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

475. Arctic Ice Chart, April 1, 1974

1974. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1974. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

476. Arctic Ice Chart, April 1, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1977. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

477. Arctic Ice Chart, April 1, 1982

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1982. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

478. Arctic Ice Chart, April 1, 1984

1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1984. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

479. Arctic Ice Chart, April 1, 1985

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1985. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

480. Arctic Ice Chart, April 1, 1986

1986. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1986. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

481. Arctic Ice Chart, April 1, 1996

1996. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1996. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

482. Arctic Ice Chart, April 1, 1997

1997. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1997. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

483. Arctic Ice Chart, April 1, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1998. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

484. Arctic Ice Chart, April 10, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

485. Arctic Ice Chart, April 10, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

486. Arctic Ice Chart, April 10, 1985

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1985. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

487. Arctic Ice Chart, April 10, 1989

1989. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

488. Arctic Ice Chart, April 10, 1995

1995. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1995. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

489. Arctic Ice Chart, April 11, 1969

1969. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1969. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

490. Arctic Ice Chart, April 11, 1988

1988. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1988. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

491. Arctic Ice Chart, April 11, 1994

1994. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1994. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

492. Arctic Ice Chart, April 11, 2000

2000. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 2000. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

493. Arctic Ice Chart, April 12, 1973

1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

494. Arctic Ice Chart, April 12, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1977. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

495. Arctic Ice Chart, April 12, 1978

1978. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1978. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

496. Arctic Ice Chart, April 12, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

497. Arctic Ice Chart, April 13, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1971. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

498. Arctic Ice Chart, April 13, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

499. Arctic Ice Chart, April 13, 1976

1976. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1976. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

500. Arctic Ice Chart, April 13, 1982

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1982. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).