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  1. 1
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    Economic size of metal-mine airways

    Published 1932
    “…Mines Bur. Info. Circ. No. 6585.…”
    Government Document Microfilm Book

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  2. 2
    Cover Image

    Economic size of metal-mine airways.

    Published 1932
    “…Mines Bur. Info. Circ. No. 6585.…”
    Full Text (via ProQuest)
    Government Document eBook

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