Placer mining in Alaska : methods and costs at operations using hydraulic and mechanical excavation equipment with nonfloating washing plants

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100 1 ⊔ ‡aThomas, Bruce I.
245 1 0 ‡aPlacer mining in Alaska : ‡bmethods and costs at operations using hydraulic and mechanical excavation equipment with nonfloating washing plants / ‡cby B.I. Thomas [and others].
260 ⊔ ⊔ ‡aWashington, D. C. : ‡bUnited. States. Bureau of Mines, ‡c1959.
300 ⊔ ⊔ ‡aiv, 34 p. : ‡bill. ; ‡c26 cm.
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490 0 ⊔ ‡aInformation circular / United States. Bureau of Mines ; ‡v7926
538 ⊔ ⊔ ‡aMode of access: Internet.
650 ⊔ 0 ‡aPlacer deposits ‡zAlaska.
650 ⊔ 0 ‡aMines and mineral resources ‡zAlaska. ‡0http://id.loc.gov/authorities/subjects/sh2008107815
700 1 ⊔ ‡aKerns, William H.
700 1 ⊔ ‡aWolff, Ernest.
700 1 ⊔ ‡aCook, Donald J.
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