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by Floyd, P. H.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1954
Description: 6 pages : illustrations ; 27 cm.
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by Floyd, P. H.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1952
Description: 14 pages, 2 leaves of plates : illustrations ; 27 cm.
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by Floyd, P. H.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1954
Description: 13 pages ; 27 cm.
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Lead mines and mining Lead ores Scheelite Tungsten mines and mining