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1. 2000 county boundaries of the United States

Polygon Harvard University Public content
1972. Geological Survey (U.S.). This map layer portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was crea... U.S. Geological Survey.

2. 7th congressional district of Indiana, 1972.

Indiana University Public content
1972. Boundaries of 7th Congressional District of Indiana in 1972 drawn on a copy of Counties and townships map, p. 10 of Kingsbury, Robert C., An atlas ...

3. Arctic Ice Chart, April 10, 1972

Polygon Stanford University Public content
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).

4. Arctic Ice Chart, April 12, 1973

Polygon Stanford University Public content
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).

5. Arctic Ice Chart, April 13, 1972

Polygon Stanford University Public content
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).

6. Arctic Ice Chart, April 16, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

7. Arctic Ice Chart, April 17, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

8. Arctic Ice Chart, April 2, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1973. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

9. Arctic Ice Chart, April 20, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 20, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

10. Arctic Ice Chart, April 24, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 24, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

11. Arctic Ice Chart, April 24, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 24, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

12. Arctic Ice Chart, April 26, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 26, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

13. Arctic Ice Chart, April 27, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 27, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

14. Arctic Ice Chart, April 30, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 30, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

15. Arctic Ice Chart, April 4, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 4, 1972. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

16. Arctic Ice Chart, April 5, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 5, 1973. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

17. Arctic Ice Chart, April 6, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 6, 1972. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

18. Arctic Ice Chart, April 9, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1973. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

19. Arctic Ice Chart, August 10, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 10, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

20. Arctic Ice Chart, August 12, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 12, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

21. Arctic Ice Chart, August 14, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 14, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

22. Arctic Ice Chart, August 16, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 16, 1973. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

23. Arctic Ice Chart, August 2, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 2, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

24. Arctic Ice Chart, August 20, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 20, 1973. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

25. Arctic Ice Chart, August 21, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 21, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

26. Arctic Ice Chart, August 23, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 23, 1973. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

27. Arctic Ice Chart, August 24, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 24, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

28. Arctic Ice Chart, August 27, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 27, 1973. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

29. Arctic Ice Chart, August 29, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 29, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

30. Arctic Ice Chart, August 3, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 3, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

31. Arctic Ice Chart, August 30, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 30, 1973. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

32. Arctic Ice Chart, August 31, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 31, 1972. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).

33. Arctic Ice Chart, August 6, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 6, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

34. Arctic Ice Chart, August 7, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 7, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

35. Arctic Ice Chart, December 10, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 10, 1973. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

36. Arctic Ice Chart, December 11, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 11, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

37. Arctic Ice Chart, December 13, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 13, 1973. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

38. Arctic Ice Chart, December 14, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 14, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

39. Arctic Ice Chart, December 17, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 17, 1973. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

40. Arctic Ice Chart, December 18, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 18, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

41. Arctic Ice Chart, December 20, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 20, 1973. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

42. Arctic Ice Chart, December 22, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 22, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

43. Arctic Ice Chart, December 28, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 28, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

44. Arctic Ice Chart, December 28, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 28, 1973. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

45. Arctic Ice Chart, December 3, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 3, 1973. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

46. Arctic Ice Chart, December 4, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 4, 1972. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

47. Arctic Ice Chart, December 6, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 6, 1973. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

48. Arctic Ice Chart, December 7, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 7, 1972. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

49. Arctic Ice Chart, February 1, 1973

Polygon Stanford University Public content
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 1, 1973. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

50. Arctic Ice Chart, February 10, 1972

Polygon Stanford University Public content
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 10, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).