The enrichment of ore deposits /
Emmons, William H. 1876-
The enrichment of ore deposits / By William harvey emmons - 530 páginas - U.s. geological survey. bulletin ; 625 .
A la cabeza de la portada: department of the interior
Yacimientos minerales
TN263 / E55
The enrichment of ore deposits / By William harvey emmons - 530 páginas - U.s. geological survey. bulletin ; 625 .
A la cabeza de la portada: department of the interior
Yacimientos minerales
TN263 / E55