Search Results - "C 22.3:303"

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  1. 1
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    Tests of strength of roof supports used in anthracite mines of Pennsylvania

    Published 1929
    “…C 22.3:303…”
    Government Document Microfilm Book

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  2. 2
    Cover Image

    Tests of strength of roof supports used in anthracite mines of Pennsylvania.

    Published 1929
    “…C 22.3:303…”
    Full Text (via ProQuest)
    Government Document eBook

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