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Lexington, Kentucky : The University Press of Kentucky, 1976. ©1976
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2.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2007.
KF27 .E3 2007d |
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3.
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Washington, U.S. Govt. Print. Off., 1972.
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4.
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Monticello, Ill. : Vance Bibliographies, 1980.
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5.
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New York : Routledge, 2003.
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6.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2006.
KF26 .E55 2006m |
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EP 4.2: SU 7/10 |
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8.
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[Washington, D.C. : U.S. Dept. of Labor, Mine Safety and Health Administration, 1997?]
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9.
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New York : McGraw-Hill, 1980
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10.
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Washington, D. C. : Office of Coal Research, U. S. Department of the Interior, 1972.
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