80 pp. Illustrated from photographs; advertisements. 23x15.2 cm. (9x6"), original wrappers.

An historical overview of the mining activities in Boulder County, Colorado, with numerous photographic views of mines, miners, minerals and the countryside, plus many advertisements, most for mining and milling supplies and equipment. Silver Jubilee edition. OCLC/WorldCat lists only one copy, at Stanford University. Ink name of former owner, with Boulder address, in top margin of fist page, with note in top margin of last page, "Bought at 'Book Fair', Boulder, Colo. 5-20-1955."