Geological Survey (U.S.) & Crysdale, B. L. (1990). Map showing contours on the top of the Pennsylvanian and Permian Minnelusa Formation and equivalents, Powder River Basin, Wyoming and Montana. The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Bonnie L. Crysdale. Map Showing Contours on the Top of the Pennsylvanian and Permian Minnelusa Formation and Equivalents, Powder River Basin, Wyoming and Montana. Reston, Va.: The Survey, 1990.
MLA (9th ed.) CitationGeological Survey (U.S.) and Bonnie L. Crysdale. Map Showing Contours on the Top of the Pennsylvanian and Permian Minnelusa Formation and Equivalents, Powder River Basin, Wyoming and Montana. The Survey, 1990.
Warning: These citations may not always be 100% accurate.