Showing 1 - 2 of 2 for search: 'Ruark, J. R.', query time: 0.03s
by Ruark, J. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1956
Description: 26 pages : illustrations ; 27 cm.
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by Wells, W. E.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1952
Description: 19 pages : illustrations ; 27 cm.
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