Concentration tests on various base-metal ores

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100 1 ‡aEngel, Abraham L.
245 1 0 ‡aConcentration tests on various base-metal ores / ‡cby A.L. Engel.
260 ‡a[Pittsburgh, PA] : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c1952.
300 ‡a14 p. ; ‡c27 cm.
490 0 ‡aReport of investigations / United States Department of the Interior, Bureau of Mines ; ‡v4927
538 ‡aMode of access: Internet.
650 0 ‡aOre deposits ‡xTesting.
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