underground mining practice and costs of a fluorspar mine at rosiclare, illinois. us bureau of mines information circular #6384
Cronk, A. H.
Wash;: USGPO, 1930.. 11pp Very good (Item ID: 17799)
$10.00
Wash;: USGPO, 1930.. 11pp Very good (Item ID: 17799)
$10.00