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  1. 1

    Beneficiation tests on gypsum rock from Washington County, Idaho / by Prater, Lewis S. (Lewis Seward), 1915-2000

    Published 1947
    Book
  2. 2

    Beneficiation tests on Latah County clays / by Prater, Lewis S. (Lewis Seward), 1915-2000

    Published 1943
    Book
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