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31. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

32. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

33. County Boundaries of the United States, 2000

2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

34. County Subdivisions, Arizona, 1930

1930. University of Arizona. Library. Statewide coverage of 1930 Census County Subdivisions (Minor Civil Divisions). University of Arizona.

35. County Subdivisions, Arizona, 1940

1940. University of Arizona. Library. Statewide coverage of 1940 Census County Subdivisions (Minor Civil Divisions). University of Arizona.

36. County Subdivisions, Arizona, 1950

1950. University of Arizona. Library. Statewide coverage of 1950 Census County Subdivisions. University of Arizona.

37. County Subdivisions, Arizona, 1960

1960. University of Arizona. Library. Statewide coverage of 1960 Census County Subdivisions. University of Arizona.

38. County Subdivisions, Arizona, 1970

1970. University of Arizona. Library. Statewide coverage of 1970 Census County Subdivisions. University of Arizona.

39. Elementary School Districts, Arizona, 2000

2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the elementary school district boundaries in Arizona. The elementary school districts provide education to the lo... U.S. Census Bureau. Geography Division.

40. Federal Lands of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of... National Atlas of the United States.