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Guidebook of the Western United StatesPart A The Northern Pacific route with a side trip to Yellowstone ParkBookPublicado 1916
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Placer mining in the western United StatesPt I General information hand shoveling and ground sluicingBookpor Gardner, E. D. (Eugene Delos), 1885-
Publicado 1934 -
Placer mining in the western United StatesPt 2 Hydraulicking treatment of placer concentrates and marketing of goldBookpor Gardner, E. D. (Eugene Delos), 1885-
Publicado 1934 -
por Petrides, George A.
Publicado 1992 -
Field book of western wild flowersthe ultimate guide to flowers growing west of the Rocky MountainsBook