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by Allshouse, Sharon D., Allshouse, Sharon D., Davis, Alan, 1932-
University Park, Pa. : Coal Research Section, The Pennsylvania State University, 1984
University Park, Pa. : Coal Research Section, The Pennsylvania State University, 1984
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by Minne, Anne
Washington, D.C. : U.S. Dept. of Energy, 1988
Washington, D.C. : U.S. Dept. of Energy, 1988
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by Baratta, Anthony John, 1945-
University Park, Pa. : Pennsylvania State University, 1981
University Park, Pa. : Pennsylvania State University, 1981
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