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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).