1.
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[Washington] : G.P.O. ; Alexandria, VA : For sale by the Distribution Branch, U.S. Geological Survey, 1986.
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2.
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[Washington, D.C. : Mineralogical Society of America], 1974.
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3.
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Auburn, Ala., Water Resources Research Institute, Auburn University, 1972.
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4.
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Chantilly, Virginia : The Mineralogical Society of America, [2006] ©2006
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5.
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[Washington] : Dept. of the Interior, Bureau of Mines, 1978.
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6.
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Monroeville, Pa. : Bituminous Coal Research, Inc., 1968.
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