APA (7th ed.) Citation

(1974). Hydrologic unit map 1974 State of Ohio (Drainage modified 1974.). U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hydrologic Unit Map 1974 State of Ohio. Drainage modified 1974. Reston, Virginia: U.S. Geological Survey, 1974.

MLA (9th ed.) Citation

Hydrologic Unit Map 1974 State of Ohio. Drainage modified 1974. U.S. Geological Survey, 1974.

Warning: These citations may not always be 100% accurate.