APA (7th ed.) Citation

United States. Soil Conservation Service. (1978). Illinois river basins progress map (Rev. 12-5-77.). United States Soil Conservation Service.

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. Illinois River Basins Progress Map. Rev. 12-5-77. Lincoln, NB: United States Soil Conservation Service, 1978.

MLA (8th ed.) Citation

United States. Soil Conservation Service. Illinois River Basins Progress Map. Rev. 12-5-77. United States Soil Conservation Service, 1978.