-
по Shedd, Solon, 1860-1941
Опубликовано 1924 -
Coal in Washington;distribution geology mining preparation uses and economic value of coal resources of WashingtonBookпо Daniels, Joseph, 1884-1965
Опубликовано 1934 -
по Green, Stephen H.
Опубликовано 1949 -
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 NorthwestBookпо Pumpelly, Raphael, 1837-1923
Опубликовано 1886