Showing 1 - 3 of 3 for search: 'Berkenkotter, Richard D.', query time: 0.09s
by Berkenkotter, Richard D.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1964
Description: 38 pages : illustrations ; 27 cm.
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by Berkenkotter, Richard D.
Published: Bureau of Mines, 1963
Description: ii, 58 pages : illustrations, maps ; 27 cm.
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by Hazen, Scott W.
Published: U.S. Bureau of Mines, 1962
Description: 111 pages : illustrations, tables ; 27 cm.
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Iron ores Ore deposits Statistical methods Ores Sampling and estimation Phosphates Sampling (Statistics)