milling methods and costs at the montana mine concnetraotr of theeagle-picher lead co., ruby, ariz. us bureau of mines information circular #6497
Andrus, D. E.
Wash;: USGPO, 1931.. 14pp Very good (Item ID: 17781)
$10.00
Wash;: USGPO, 1931.. 14pp Very good (Item ID: 17781)
$10.00