APA (7th ed.) Citation

Geological Survey (U.S.). (1991). Skagway (A-1) NW quadrangle, Alaska: 1:25 000-scale series (topographic) (Provisional ed. 1991.). The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Skagway (A-1) NW Quadrangle, Alaska: 1:25 000-scale Series (topographic). Provisional ed. 1991. Reston, Va. : Fairbanks, Alaska: The Survey, 1991.

MLA (9th ed.) Citation

Geological Survey (U.S.). Skagway (A-1) NW Quadrangle, Alaska: 1:25 000-scale Series (topographic). Provisional ed. 1991. The Survey, 1991.