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1. 1:100,000 Digital Raster Graphics for Delaware

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

2. 1:100,000 Digital Raster Graphics for Maryland

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

3. 1:100,000 Digital Raster Graphics for Virginia

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

4. 1:100,000 Digital Raster Graphics for West Virginia

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

5. 1:24,000 - 7.5 minute digital elevation models (DEM) for the District of Columbia (30 meter)

2000. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

6. 1:24,000 - 7.5 minute digital elevation models (DEM) for Virginia (30 meter)

2000. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

7. 1:24,000 - 7.5 minute Digital Raster Graphics for Maryland

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

8. 1:24,000 - 7.5 minute Digital Raster Graphics for New Jersey

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

9. 1:24,000 - 7.5 minute Digital Raster Graphics for the District of Columbia

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

10. 1:24,000 - 7.5 minute Digital Raster Graphics for West Virginia

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

11. 1:24,000 -7.5 minute digital elevation models (DEM) for West Virginia (30 meter)

2000. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

12. 1:250,000 Digital Raster Graphics for Delaware

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

13. 1:250,000 Digital Raster Graphics for Maryland

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

14. 1:250,000 Digital Raster Graphics for West Virginia

2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

15. Chesapeake Bay Watershed Land Cover Data Series 1984

1984. U.S. Geological Survey. To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

16. Chesapeake Bay Watershed Land Cover Data Series 1992

1992. U.S. Geological Survey. To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

17. Chesapeake Bay Watershed Land Cover Data Series 2001

2001. U.S. Geological Survey. To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

18. Chesapeake Bay Watershed Land Cover Data Series 2006

2006. U.S. Geological Survey. To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

19. Digital Elevation Model - 10-Meter: Pennsylvania

1996. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

20. Digital Elevation Model - 30-Meter: Pennsylvania

1996. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...

21. Geographic Names Information System (GNIS) for Alaska and Hawaii 2008

2008. U.S. Geological Survey. The Geographic Names Information System (GNIS), developed by the U.S. Geological Survey in cooperation with the U.S. Board on Geographic Names (BGN...

22. Geographic Names Information System (GNIS) for Pennsylvania

2007. U.S. Geological Survey. The Geographic Names Information System (GNIS), developed by the U.S. Geological Survey in cooperation with the U.S. Board on Geographic Names (BGN...

23. Geographic Names Information System (GNIS) for Pennsylvania

1981. U.S. Geological Survey. The Geographic Names Information System (GNIS), developed by the U.S. Geological Survey in cooperation with the U.S. Board on Geographic Names (BGN...

24. Historic topographic maps for Pennsylvania

2005. U.S. Geological Survey. Historic USGS 15 minute topographic maps for Pennsylvania as collected from the MapTech Historical Map Collection at 'http://historical.maptech.com...

25. Historic topographic maps for Pennsylvania, Version 2 (Albers)

2006. U.S. Geological Survey. A newly revised version of the historic USGS 15 minute topographic maps for Pennsylvania as collected from the MapTech Historical Map Collection at...

26. National Atmospheric Deposition Program 2004 - Pennsylvania

2004. U.S. Geological Survey. The National Atmospheric Deposition Programational Trends Network (NADPTN) is a nationwide network of precipitation monitoring sites. The network i...

27. National Atmospheric Deposition Program 2005 - Pennsylvania

2005. U.S. Geological Survey. The National Atmospheric Deposition Programational Trends Network (NADPTN) is a nationwide network of precipitation monitoring sites. The network i...

28. National Land Cover Database 2001 - Imperviousness Layer - Southeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resolution Land Charact...

29. National Land Cover Database 2001 - Tree Canopy Layer - Pennsylvania and Northeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 60 was produced through a cooperative project conducted by the Multi-Resol...

30. National Land Cover Database 2001 - Tree Canopy Layer - Southeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resol...

31. National Land Cover Database 2001 - Imperviousness Layer - Pennsylvania and Northeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 for mapping zone 60 was produced through a cooperative project conducted by the Multi-Resolution Land Charact...

32. National Land Cover Database 2001 - Imperviousness Layer - Western Pennsylvania and Ohio

2003. U.S. Geological Survey. The National Land Cover Database 2001 for mapping zone 47 was produced through a cooperative project conducted by the Multi-Resolution Land Charact...

33. National Land Cover Database 2001 - Land Cover Layer - Pennsylvania and Northeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 60 was produced through a cooperative project conducted by the Multi-Resolu...

34. National Land Cover Database 2001 - Land Cover Layer - Southeast

2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resolu...

35. National Land Cover Database 2001 - Land Cover Layer - Western Pennsylvania and Ohio

2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 47 was produced through a cooperative project conducted by the Multi-Resolu...

36. National Land Cover Database 2001 - Tree Canopy Layer - Western Pennsylvania and Ohio

2004. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 47 was produced through a cooperative project conducted by the Multi-Resol...

37. New York state boundary with offshore boundaries

2005. U.S. Geological Survey. New York state boundary inculdes offshore boundaries (oceans, bays, and great lakes). This map layer portrays the State boundaries of the United St...

38. Quadrangle Boundaries for the continental United States

2002. U.S. Geological Survey. Quadrangle Boundaries for the continental United States and Hawaii.

39. Quadrangle Boundaries: Pennsylvania

2002. U.S. Geological Survey. Quadrangle Boundaries of Pennsylvania.

40. Topographic Maps (DRG) for Pennsylvania 1:24,000 - Albers - cropped collars

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars in Albers projection.

41. Topographic Maps (DRG) for Pennsylvania 1:24,000 - UTM

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

42. Topographic Maps (DRG) for Pennsylvania 1:24,000 - UTM - cropped collars

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars, georeferenced to the UTM grid.

43. Topographic Maps (DRG) for Pennsylvania 1:24,000 - UTM - NAD 1983

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

44. Topographic Maps (DRG) for Pennsylvania 1:24,000 - UTM - NAD 1983 - cropped collars

1996. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map with cropped collars, georeferenced to the UTM gr...

45. United States Concise - Geographic Names Information System (GNIS)

2009. U.S. Geological Survey. The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS f...

46. United States Historic Features - Geographic Names Information System (GNIS)

2009. U.S. Geological Survey. The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS f...

47. United States Populated Places - Geographic Names Information System (GNIS)

2009. U.S. Geological Survey. The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS f...

48. USGS Geopdfs for District of Columbia

2011. U.S. Geological Survey. Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydro...

49. USGS Geopdfs for New Jersey

2014. U.S. Geological Survey. Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydro...

50. USGS Geopdfs for Pennsylvania 30 x 60 Minute

2011. U.S. Geological Survey. GeoPDF 30 x 60 Minute Quadrangle Map for Pennsylvania.

51. USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania

2011. U.S. Geological Survey. This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footprint. An orthoi...

52. USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania - Tile Index

2011. U.S. Geological Survey. TILE INDEX - 'This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footpr...

53. Zebra Mussel Distribution: United States

2008. U.S. Geological Survey. The concern caused by the explosive spread of the zebra mussel, (Dreissena polymorpha), within the United States resulted in passage of the Nonindi...