APA (7th ed.) Citation

McGrew, L. W. (1977). Geologic map of the Black Butte Mountain quadrangle, Meagher County, Montana. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

McGrew, Laura W. Geologic Map of the Black Butte Mountain Quadrangle, Meagher County, Montana. Reston, Va.: U.S. Geological Survey, 1977.

MLA (9th ed.) Citation

McGrew, Laura W. Geologic Map of the Black Butte Mountain Quadrangle, Meagher County, Montana. U.S. Geological Survey, 1977.