1. Congressional districts for the 92nd Congress (including redistricting actions to August 1, 1970) Author/Creator: United States. Bureau of the Census Publication/Creation: Washington : U.S. Govt. Print. Off, 1970 Resource Type: Map Access & Availability: Loading
2. Congressional districts for the 93rd Congress Author/Creator: United States. Bureau of the Census Publication/Creation: Washington, D.C. : U.S. Govt. Print. Off, 1972 Resource Type: Map Access & Availability: Loading
3. Corn yield per acre, by counties of the United States, 1964 Author/Creator: United States. Bureau of the Census. Geography Division, cartographer Publication/Creation: Washington, D.C. : For sale by the Superintendent of Document, U.S. Government Printing Office, 1970 Resource Type: Map Access & Availability: Loading