1.
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[Washington] : Mining Enforcement and Safety Administration, [1975]
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2.
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Cambridge : Bolt Beranek and Newman, 1977.
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3.
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Cham, Switzerland : Springer, 2017.
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4.
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Golden, Colo. : Martin Consultants, 1982.
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5.
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[Blacksburg, Virginia Polytechnic Institute, 1970]
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6.
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[Washington, D.C.?] : U.S. Dept. of the Interior, 1984.
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7.
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[Washington] : Mining Enforcement and Safety Administration, [1975]
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