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1. American Indian Reservations, Arizona, 1980

1980. University of Arizona. Library. Statewide coverage of 1980 American Indian Reservations. Boundaries that cross into the adjacent states are included. Population data from U.S. Bur... University of Arizona.

2. 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.).