Pumpelly, R., & Willis, B. (1886). 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 Northwest. Govt.Print. Off..
Style de citation Chicago (17e éd.)Pumpelly, Raphael, et Bailey Willis. 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 Northwest. Washington: Govt.Print. Off., 1886.
Style de citation MLA (8e éd.)Pumpelly, Raphael, et Bailey Willis. 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 Northwest. Govt.Print. Off., 1886.