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Report on the mining industries of the United States (exclusive of the precious metals)with special investigation into the iron resources of the republic and into the Cretaceous coals of the NorthwestBook由 Pumpelly, Raphael, 1837-1923
出版 1886 -
Coal in Washington;distribution geology mining preparation uses and economic value of coal resources of WashingtonBook由 Daniels, Joseph, 1884-1965
出版 1934