Simple treatment methods for oxide gold and silver ores

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086 0 ‡aI 28.23:4758
100 1 ‡aEngel, Abraham L.
245 1 0 ‡aSimple treatment methods for oxide gold and silver ores / ‡cby A.L. Engel.
260 ‡aWashington, D.C. : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c1951.
300 ‡a14 p. : ‡bill., tables ; ‡c27 cm.
490 0 ‡aReport of investigations / United States Department of the Interior, Bureau of Mines ; ‡v4758
538 ‡aMode of access: Internet.
650 0 ‡aGold ores.
650 0 ‡aSilver ores.
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