Offered here is an original 1907 Mineralogist's Pocket Reference from The Western Mineralogical Company in Denver, Colorado. Measures 3.0 x 5.75. Black colored heavy paper covers. Includes forty seven pages of very well detailed information and photographs of the Assay Laboratory and the minerals and precious metals the company assayed. Also includes Charges for Assays and the methods that assays are determined in the laboratory. I do not believe this company was in business very long before being taken over from another Denver Assayer. Great display reference and piece of Denver mining history. Thanks for looking!