APA (7th ed.) Citation

(1975). Hydrologic unit map 1974 State of Wisconsin (Compiled in 1966. Ed. of 1968.). U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hydrologic Unit Map 1974 State of Wisconsin. Compiled in 1966. Ed. of 1968. Reston, Virginia: U.S. Geological Survey, 1975.

MLA (9th ed.) Citation

Hydrologic Unit Map 1974 State of Wisconsin. Compiled in 1966. Ed. of 1968. U.S. Geological Survey, 1975.