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Shafts Excavations
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Bonilla, Manuel G., 1920- author.
[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1990.
1990
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Shafts Machine Elements
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ElectronicResource GovDoc
Doernbach, Jay.
[Washington, D.C.] : National Aeronautics and Space Administration, [1990]
1990
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