Search U.S. government technical reports digitized or harvested by TRAIL.

Keyword Search

Milling method and cost at the conglomerate mill of the Calumet & Hecla Consolidated Copper Co

Published Year

• 1930-1939 (1)

Subject

• Copper mines and mining--Michigan (1) *

Author

• Benedict, C. Harry, (1) *

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

Search developed and maintained by the University of Washington Libraries
Copyright 2010