Preliminary tests of gold and zinc ores from Buzzard mine, Placerville, Calif

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100 1 ‡aEngel, A. L. ‡q(Abraham L.)
245 1 0 ‡aPreliminary tests of gold and zinc ores from Buzzard mine, Placerville, Calif. / ‡cby A.L. Engel and H.J. Heinen.
260 ‡a[Washington, D.C.] : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c1949.
300 ‡a12 p. ; ‡c27 cm.
490 0 ‡aReport of investigations / United States Department of the Interior, Bureau of Mines ; ‡v4615
500 ‡a"December 1949."
538 ‡aMode of access: Internet.
650 0 ‡aMine examination ‡zCalifornia ‡zPlacerville Region.
650 0 ‡aZinc ores ‡zCalifornia ‡zPlacerville Region ‡xTesting.
650 0 ‡aGold ores ‡zCalifornia ‡zPlacerville Region ‡zTesting.
700 1 ‡aHeinen, H. J. ‡q(Harold J.)
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