Origin of thick Lower Tertiary coal beds in the Powder River Basin, Wyoming and Montana--some paleogeographic constraints /
Seeland, David A.
Denver, CO : Dept. of the Interior, U.S. Geological Survey ; Washington : U.S. G.P.O.,
1993.
Includes bibliographical references (p. Q11-Q13).
Geology, Stratigraphic
Geology, Stratigraphic
Coal