947 resultados para Underground Mines
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Title varies slightly.
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Mode of access: Internet.
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Bibliography: p. 58-59.
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"Prepared under Contract No. CST 263 between the National Academy of Sciences and the National Bureau of Standards."
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Mode of access: Internet.
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Mode of access: Internet.
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Work performed at the Battelle Memorial Institute, Columbus, Ohio.
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Mode of access: Internet.
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Mode of access: Internet.
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Includes bibliographical references.
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"CR 810052."
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Mode of access: Internet.
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"Report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission and review of the compressive strength of anthracite, bituminous coals and mine supports."