Geological Survey (U.S.) & Pierce, F. W. (1990). Cross sections showing coal stratigraphy of the southeastern Powder River basin, Wyoming. The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Frances Wahl Pierce. Cross Sections Showing Coal Stratigraphy of the Southeastern Powder River Basin, Wyoming. Reston, Va.: The Survey, 1990.
MLA (9th ed.) CitationGeological Survey (U.S.) and Frances Wahl Pierce. Cross Sections Showing Coal Stratigraphy of the Southeastern Powder River Basin, Wyoming. The Survey, 1990.
Warning: These citations may not always be 100% accurate.