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  1. 1
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    Shaft Sinking by Rotary Drilling.

    Published 1945
    “…I 28.27:7336…”
    Full Text (via ProQuest)
    Government Document eBook

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  2. 2
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    Shaft sinking by rotary drilling / by Platt, D. H. (Douglas H.)

    Published 1945
    “…I 28.27:7336…”
    Search for the full-text version of this title in HathiTrust
    Government Document Book

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