Search Results - Bolmer, R. L. (Robert L.)

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    Sinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, Colorado / by Bolmer, R. L. (Robert L.)

    Published 1962
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    Government Document Book

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    Sinking a large-diameter, concrete-lined access shaft : Harold D. Roberts Tunnel, Colorado / by Bolmer, R. L. (Robert L.)

    Published 1961
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    Government Document Book

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