University of Arizona

Certain collections will be inaccessible from March 20-May 5 as we improve our shelving. Contact us to plan a research visit.

Assay Certificate for Spenazuma Mining and Milling Company Assay and Chemical Laboratories, 1899

Assay Certificate for Spenazuma Mining and Milling Company Assay and Chemical Laboratories, 1899

Assay Certificate for Spenazuma Mining and Milling Company Assay and Chemical Laboratories, Spenazume, Arizona, 1899