APA (7th ed.) Citation

Geological Survey (U.S.), Denson, N. M., & Pierson, C. T. (1991). Geologic map showing the thickness and structure of the Anderson-Wyodak coal bed in the south half of the Powder River Basin, northeastern Wyoming. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), N. M. Denson, and Charles Thomas Pierson. Geologic Map Showing the Thickness and Structure of the Anderson-Wyodak Coal Bed in the South Half of the Powder River Basin, Northeastern Wyoming. Reston, Va.: The Survey, 1991.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map Showing the Thickness and Structure of the Anderson-Wyodak Coal Bed in the South Half of the Powder River Basin, Northeastern Wyoming. The Survey, 1991.