-
Placer mining in the western United StatesPt I General information hand shoveling and ground sluicingBookby Gardner, E. D. (Eugene Delos), 1885-
Published 1934 -
Placer mining in the western United StatesPt 2 Hydraulicking treatment of placer concentrates and marketing of goldBookby Gardner, E. D. (Eugene Delos), 1885-
Published 1934