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1. Arctic Ice Chart, April 2, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

2. Arctic Ice Chart, April 22, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 22, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

3. Arctic Ice Chart, April 29, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 29, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

4. Arctic Ice Chart, April 8, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

5. Arctic Ice Chart, August 12, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 12, 1991. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

6. Arctic Ice Chart, August 19, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 19, 1991. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

7. Arctic Ice Chart, August 26, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 26, 1991. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

8. Arctic Ice Chart, August 5, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 5, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

9. Arctic Ice Chart, December 16, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 16, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

10. Arctic Ice Chart, December 2, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 2, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

11. Arctic Ice Chart, December 23, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 23, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

12. Arctic Ice Chart, December 30, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 30, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

13. Arctic Ice Chart, December 9, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 9, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

14. Arctic Ice Chart, February 11, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 11, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

15. Arctic Ice Chart, February 25, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 25, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

16. Arctic Ice Chart, February 4, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 4, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

17. Arctic Ice Chart, January 14, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 14, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

18. Arctic Ice Chart, January 21, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 21, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

19. Arctic Ice Chart, January 28, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 28, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

20. Arctic Ice Chart, January 7, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 7, 1991. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

21. Arctic Ice Chart, July 15, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for July 15, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

22. Arctic Ice Chart, July 22, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for July 22, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

23. Arctic Ice Chart, July 29, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for July 29, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

24. Arctic Ice Chart, July 8, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for July 8, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

25. Arctic Ice Chart, June 10, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 10, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

26. Arctic Ice Chart, June 17, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 17, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

27. Arctic Ice Chart, June 24, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 24, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

28. Arctic Ice Chart, June 3, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 3, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

29. Arctic Ice Chart, March 11, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for March 11, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

30. Arctic Ice Chart, March 18, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for March 18, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

31. Arctic Ice Chart, March 25, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for March 25, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

32. Arctic Ice Chart, March 4, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for March 4, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

33. Arctic Ice Chart, May 13, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for May 13, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

34. Arctic Ice Chart, May 21, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for May 21, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

35. Arctic Ice Chart, May 27, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for May 27, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

36. Arctic Ice Chart, November 11, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for November 11, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

37. Arctic Ice Chart, November 18, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for November 18, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

38. Arctic Ice Chart, November 25, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for November 25, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

39. Arctic Ice Chart, November 4, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for November 4, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

40. Arctic Ice Chart, October 14, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for October 14, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

41. Arctic Ice Chart, October 21, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for October 21, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

42. Arctic Ice Chart, October 28, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for October 28, 1991. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

43. Arctic Ice Chart, September 17, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 17, 1991. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

44. Arctic Ice Chart, September 2, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 2, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

45. Arctic Ice Chart, September 23, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 23, 1991. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

46. Arctic Ice Chart, September 30, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 30, 1991. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

47. Arctic Ice Chart, September 9, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 9, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

48. Disputed Boundaries: Brasil, 1991

1991. Instituto Brasileiro de Geografia e Estatística. This polygon shapefile represents disputed boundaries of Brazil in 1991. These data were created using a custom World Polyconic projection. This la... Instituto Brasileiro de Geografia e Estatística.

49. District Boundaries of India, 1991

1991. ML InfoMap (Firm). This layer is a polygon theme representing district boundaries of India for 1991. Includes district socio-demographic Census attribute data such as... ML InfoMap (Firm).

50. Heat Flow, Bosnia and Herzegovina, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Bosnia and Herzegovina compiled from sources in 1991. Heat flow is a measure of heat loss across t... International Heat Flow Commission.

51. Heat Flow, Croatia, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Croatia compiled from sources in 1991. Heat flow is a measure of heat loss across the surface of t... International Heat Flow Commission.

52. Heat Flow, Honduras, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Honduras compiled from sources in 1991. Heat flow is a measure of heat loss across the surface of ... International Heat Flow Commission.

53. Heat Flow, Macedonia, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Macedonia (Republic) compiled from sources in 1991. Heat flow is a measure of heat loss across the... International Heat Flow Commission.

54. Heat Flow, Montenegro, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Montenegro compiled from sources in 1991. Heat flow is a measure of heat loss across the surface o... International Heat Flow Commission.

55. Heat Flow, Netherlands, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Netherlands compiled from sources in 1991. Heat flow is a measure of heat loss across the surface ... International Heat Flow Commission.

56. Heat Flow, Serbia, 1991-2008

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Serbia compiled from sources dating from 1991 to 2008. Heat flow is a measure of heat loss across ... International Heat Flow Commission.

57. Heat Flow, Slovenia, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Slovenia compiled from sources in 1991. Heat flow is a measure of heat loss across the surface of ... International Heat Flow Commission.

58. Heat Flow, Syria, 1991

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Syria compiled from sources in 1991. Heat flow is a measure of heat loss across the surface of the... International Heat Flow Commission.

59. Heat Flow, Turkey, 1991-1998

1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Turkey compiled from sources dating from 1991 to 1998. Heat flow is a measure of heat loss across ... International Heat Flow Commission.

60. Juvenile Salmonid Abundance Monitoring: Gird Creek, Russian River, California, 1991-2001

1991. Circuit Rider Productions. This line shapefile represents juvenile abundance monitoring that was conducted in Gird Creek (a tributary of the Russian River) to evaluate spawni... Circuit Rider Productions.

61. Juvenile Salmonid Abundance Monitoring: Green Valley Creek, Russian River, California, 1991-2001

1991. Circuit Rider Productions. This line shapefile represents the juvenile salmonid abundance monitoring that was conducted in Green Valley Creek (a tributary of the Russian Rive... Circuit Rider Productions.

62. Juvenile Salmonid Abundance Monitoring: Maacama Creek, Russian River, California, 1991-2001

1991. Circuit Rider Productions. This line shapefile represents the juvenile salmonid abundance monitoring that was conducted in Maacama Creek (a tributary of the Russian River) to... Circuit Rider Productions.

63. Juvenile Salmonid Abundance Monitoring: Mark West Creek, Russian River, California, 1991-2001

1991. Circuit Rider Productions. This line shapefile represents the juvenile salmonid abundance monitoring that was conducted in Mark West Creek (a tributary of the Russian River) ... Circuit Rider Productions.

64. Juvenile Salmonid Abundance Monitoring: Sausal Creek, Russian River, California, 1991-2001

1991. Circuit Rider Productions. This line shapefile represents the juvenile salmonid abundance monitoring that was conducted in Sausal Creek (a tributary of the Russian River) to ... Circuit Rider Productions.

65. Landcover Change: Russian River Basin, California, 2002

1991. Circuit Rider Productions. This polygon shapefile depicts increases and decreases in vegetative cover over 5 year periods in the Russian River Watershed region of California.... Circuit Rider Productions.

66. Municipal Boundaries: Brasil, 1991

1991. Instituto Brasileiro de Geografia e Estatística. This polygon shapefile represents the municipal boundaries of Brazil in 1991. These data were created using a custom World Polyconic projection. Th... Instituto Brasileiro de Geografia e Estatística.

67. Municipalities: Brasil, 1991

1991. Instituto Brasileiro de Geografia e Estatística. This point shapefile contains the locations of municipalities of Brazil in 1991. These data were created using a custom World Polyconic projection.... Instituto Brasileiro de Geografia e Estatística.

68. North American Countries, 2014

1991. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile contains the boundaries for Canada, Mexico, Greenland, the Dominican Republic, Cuba, Haiti, the Bahamas and Jamaica. This la... Environmental Systems Research Institute (Redlands, Calif.).

69. State Boundaries: Brasil, 1991

1991. Instituto Brasileiro de Geografia e Estatística. This polygon shapefile contains the state boundaries of Brazil in 1991. These data were created using a custom World Polyconic projection. This lay... Instituto Brasileiro de Geografia e Estatística.

70. State Boundaries of India, 1991

1991. ML InfoMap (Firm). This layer is a polygon theme representing state boundaries of India for 1991 and includes socio-demographic Census attribute data such as total po... ML InfoMap (Firm).

71. State Capitals: Brasil, 1991

1991. Instituto Brasileiro de Geografia e Estatística. This point shapefile represents the state capitals of Brazil in 1991. These data were created using a custom World Polyconic projection. This layer... Instituto Brasileiro de Geografia e Estatística.

72. United States Airports, 1991-2014

1991. TomTom International (Firm) and Environmental Systems Research Institute (Redlands, Calif.). Thisw polygon shapefile represents airport grounds and airport runways within the United States. All airports have a boundary, and most have at lea... Environmental Systems Research Institute (Redlands, Calif.).

73. Ward and Constituency Boundaries: Zambia, 1991-2006

1991. Provincial Centre for Geographic Information Services (Zambia). This polygon dataset depicts the Ward and Constituancy boundaries in Zambia from 1991 to 2006. These data were digitized from source data acquired ... Provincial Centre for Geographic Information Services (Zambia).

74. World Time Zones, 1991-2011

1991. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the time zones of the world. The time zones are best displayed with World Countries or World Administrative Divis... Environmental Systems Research Institute (Redlands, Calif.).