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2. Alabama Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Alabama Block Groups represents the U.S. Census block groups of Alabama. Environmental Systems Research Institute, Inc. (ESRI).

3. Alabama Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Alabama Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Alabama. Environmental Systems Research Institute, Inc. (ESRI).

4. Alaska Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Alaska Block Groups represents the U.S. Census block groups of Alaska. Environmental Systems Research Institute, Inc. (ESRI).

5. Alaska Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Alaska Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Alaska. Environmental Systems Research Institute, Inc. (ESRI).

6. Arizona Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Arizona Block Groups represents the U.S. Census block groups of Arizona. Environmental Systems Research Institute, Inc. (ESRI).

7. Arizona Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Arizona Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Arizona. Environmental Systems Research Institute, Inc. (ESRI).

8. Arkansas Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Arkansas Block Groups represents the U.S. Census block groups of Arkansas. Environmental Systems Research Institute, Inc. (ESRI).

9. Arkansas Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Arkansas Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Arkansas. Environmental Systems Research Institute, Inc. (ESRI).

10. Atlanta Regional Commission Georgia Congressional Districts

Polygon Harvard University Restricted content
1999. Atlanta Regional Commission (ARC). This polygon datalayer depicts boundary polygons depicting U.S. Congressional Districts in the state of Georgia as drawn by the United States Distr...

11. Atlanta Regional Commission Georgia State Senate Districts

Polygon Harvard University Restricted content
1999. Atlanta Regional Commission (ARC). This polygon datalayer depicts the State of Georgia's Senatorial Districts as adopted by the Georgia General Assembly in 1999. Used to delineate vo...

12. California Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). California Block Groups represents the U.S. Census block groups of California. Environmental Systems Research Institute, Inc. (ESRI).

13. California Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). California Tracts represents the U.S. Census tracts and block numbering areas (BNA) of California. Environmental Systems Research Institute, Inc. (ESRI).

14. Colorado Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Colorado Block Groups represents the U.S. Census block groups of Colorado. Environmental Systems Research Institute, Inc. (ESRI).

15. Colorado Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Colorado Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Colorado. Environmental Systems Research Institute, Inc. (ESRI).

16. Connecticut Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Connecticut Block Groups represents the U.S. Census block groups of Connecticut. Environmental Systems Research Institute, Inc. (ESRI).

17. Connecticut Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Connecticut Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Connecticut. Environmental Systems Research Institute, Inc. (ESRI).

18. Delaware Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Delaware Block Groups represents the U.S. Census block groups of Delaware. Environmental Systems Research Institute, Inc. (ESRI).

19. Delaware Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Delaware Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Delaware. Environmental Systems Research Institute, Inc. (ESRI).

20. District of Columbia Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). District of Columbia Block Groups represents the U.S. Census block groups of District of Columbia. Environmental Systems Research Institute, Inc. (ESRI).

21. District of Columbia Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). District of Columbia Tracts represents the U.S. Census tracts and block numbering areas (BNA) of District of Columbia. Environmental Systems Research Institute, Inc. (ESRI).

22. Florida Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Florida Block Groups represents the U.S. Census block groups of Florida. Environmental Systems Research Institute, Inc. (ESRI).

23. Florida Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Florida Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Florida. Environmental Systems Research Institute, Inc. (ESRI).

24. Georgia Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Georgia Block Groups represents the U.S. Census block groups of Georgia. Environmental Systems Research Institute, Inc. (ESRI).

25. Georgia Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Georgia Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Georgia. Environmental Systems Research Institute, Inc. (ESRI).

26. Hawaii Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Hawaii Block Groups represents the U.S. Census block groups of Hawaii. Environmental Systems Research Institute, Inc. (ESRI).

27. Hawaii Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Hawaii Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Hawaii. Environmental Systems Research Institute, Inc. (ESRI).

28. HUSCO 1790-1999

Collection Stanford University Public content
1999. Earle, Carville, Heppen, John, Otterstrom, Samuel, and Louisiana State University (Baton Rouge, La.) Department of Geography and Anthropology. "Contains ArcView shapefile format county boundary files for the contiguous United States from each decade from 1790 through 1990 (also 1999). File... Geoscience.

29. Idaho Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Idaho Block Groups represents the U.S. Census block groups of Idaho. Environmental Systems Research Institute, Inc. (ESRI).

30. Idaho Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Idaho Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Idaho. Environmental Systems Research Institute, Inc. (ESRI).

31. Illinois Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Illinois Block Groups represents the U.S. Census block groups of Illinois. Environmental Systems Research Institute, Inc. (ESRI).

32. Illinois Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Illinois Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Illinois. Environmental Systems Research Institute, Inc. (ESRI).

33. Indiana Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Indiana Block Groups represents the U.S. Census block groups of Indiana. Environmental Systems Research Institute, Inc. (ESRI).

34. Indiana Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Indiana Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Indiana. Environmental Systems Research Institute, Inc. (ESRI).

35. Iowa Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Iowa Block Groups represents the U.S. Census block groups of Iowa. Environmental Systems Research Institute, Inc. (ESRI).

36. Iowa Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Iowa Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Iowa. Environmental Systems Research Institute, Inc. (ESRI).

37. Kansas Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Kansas Block Groups represents the U.S. Census block groups of Kansas. Environmental Systems Research Institute, Inc. (ESRI).

38. Kansas Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Kansas Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Kansas. Environmental Systems Research Institute, Inc. (ESRI).

39. Kentucky Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Kentucky Block Groups represents the U.S. Census block groups of Kentucky. Environmental Systems Research Institute, Inc. (ESRI).

40. Kentucky Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Kentucky Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Kentucky. Environmental Systems Research Institute, Inc. (ESRI).

41. Louisiana Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Louisiana Block Groups represents the U.S. Census block groups of Louisiana. Environmental Systems Research Institute, Inc. (ESRI).

42. Louisiana Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Louisiana Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Louisiana. Environmental Systems Research Institute, Inc. (ESRI).

43. Maine Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Maine Block Groups represents the U.S. Census block groups of Maine. Environmental Systems Research Institute, Inc. (ESRI).

44. Maine Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Maine Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Maine. Environmental Systems Research Institute, Inc. (ESRI).

45. Maryland Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Maryland Block Groups represents the U.S. Census block groups of Maryland. Environmental Systems Research Institute, Inc. (ESRI).

46. Maryland Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Maryland Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Maryland. Environmental Systems Research Institute, Inc. (ESRI).

47. Massachusetts Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Massachusetts Block Groups represents the U.S. Census block groups of Massachusetts. Environmental Systems Research Institute, Inc. (ESRI).

48. Massachusetts Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Massachusetts Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Massachusetts. Environmental Systems Research Institute, Inc. (ESRI).

49. Michigan Block Groups

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Michigan Block Groups represents the U.S. Census block groups of Michigan. Environmental Systems Research Institute, Inc. (ESRI).

50. Michigan Tracts

Polygon Harvard University Restricted content
1999. Geographic Data Technology, Inc. (GDT), Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). Michigan Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Michigan. Environmental Systems Research Institute, Inc. (ESRI).