Sanderson, H. S.2017-07-192022-02-032017-07-192022-02-031917https://hdl.handle.net/11124/171107Scale 1:480. 1 inch = 40 feet.Blueline; on sheet 133 x 73 cm; hand colored in watercolor.Shows underground workings, some mining claims, and property holdings of the Colorado Tungsten Corporation and Boulder County Ranch.Surveyed in December 1917.Covers parts of Boulder County, Colorado. Covers parts of the Nederland quadrangle, Colorado. Commodities mined: tungsten.133 x 73 cmmine mapsengMining claims -- Colorado -- Boulder County -- MapsMines and mineral resources -- Colorado -- Boulder County -- MapsStillImage