APA (7th ed.) Citation

Geological Survey (U.S.), Roberts, L. N. R., & Van Gosen, B. S. (1986). Maps showing the coal geology of the Sarpy Creek area, Big Horn and Treasure Counties, Montana. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Laura N. Robinson Roberts, and B. S. Van Gosen. Maps Showing the Coal Geology of the Sarpy Creek Area, Big Horn and Treasure Counties, Montana. Reston, Va.: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Maps Showing the Coal Geology of the Sarpy Creek Area, Big Horn and Treasure Counties, Montana. The Survey, 1986.