Palynological studies of Middle Pennsylvania coal beds of the proposed Pennsyvania System stratotype in West Virginia /
Kosanke, Robert M.
Palynological studies of Middle Pennsylvania coal beds of the proposed Pennsyvania System stratotype in West Virginia / by Robert M. Kosanke - Washington D. C. : U. S. Government Printing Office, 1988. - vi, 73 p. : ill ; 27 cm - U. S. Geological Survey professional paper ; 1455 .
Palynological studies of Middle Pennsylvania coal beds of the proposed Pennsyvania System stratotype in West Virginia / by Robert M. Kosanke - Washington D. C. : U. S. Government Printing Office, 1988. - vi, 73 p. : ill ; 27 cm - U. S. Geological Survey professional paper ; 1455 .