Showing 1 - 2 of 2 for search: 'Poston, Roy H.', query time: 0.04s
by Poston, Roy H.
Published: U.S. Dept. of Commerce, Bureau of Mines, 1929
Description: 22 pages : illustrations ; 27 cm.
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by Poston, Roy H.
Published: U.S. Dept. of Commerce, Bureau of Mines, 1932
Description: 13 pages : illustrations ; 27 cm.
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Mineral industries Mines and mineral resources Mining engineering