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..
Cita Chicago Style (17a ed.)Pumpelly, Raphael, y 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.
Cita MLA (8a ed.)Pumpelly, Raphael, y 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.