3 books mining Colorado school of mines mining in the United States & geology bk

Three books on mining first one Colorado school of mines quarterly 78 pages by John W Vanderbilt, October 1942. Second book mining and mineral operations in the United States visitors guide 90 pages by the US Department of interior bureau of mines copyright 1967, the third geology in fuel resources of the Mesa Verde area, Montezuma and La Plata county, Colorado with two different maps, prepared with the cooperation of the national park service, 721 pages written in 1959. Three great books on mining.