APA (7th ed.) Citation

(1974). Hydrologic unit map 1974 State of New Hampshire and Vermont (Compiled in 1950. Ed. of 1951. Repr. in 1961.). U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hydrologic Unit Map 1974 State of New Hampshire and Vermont. Compiled in 1950. Ed. of 1951. Repr. in 1961. Reston, Virginia: U.S. Geological Survey, 1974.

MLA (9th ed.) Citation

Hydrologic Unit Map 1974 State of New Hampshire and Vermont. Compiled in 1950. Ed. of 1951. Repr. in 1961. U.S. Geological Survey, 1974.