Kleff, J. M.2023-02-072023-02-071951https://hdl.handle.net/11124/16333Scale approximately 1:1,200. 1 inch = 100 feet.Shows underground workings on unidentified grid.42 x 22 cmmine mapsmanuscript mapsengNo Known Copyright: http://rightsstatements.org/vocab/NKC/1.0/.Mines and mineral resources -- Colorado -- MapsStillImage