Abstract Cameron E. McKay was a mechanical engineer and eventually managed the Natomas Company. The collection includes maps, technical drawings, and assembly diagrams for dredges that McKay worked on or designed in his career as a mechanical engineer, produced for the Natomas Company, Yuba Manufacturing Company, Utah Mining and Construction Company and others in Nevada, Utah, and South America. Also, drilling records and maps for the Greenan placer deposits at Copper Canyon, Battle Mountain, Nevada;...