2017-07-202022-02-032017-07-202022-02-031900-1999https://hdl.handle.net/11124/171157Relief shown by contours and spot heights.Color."Colorado Central City quadrangle" by U.S. Geological Survey used as base map.Includes index.Covers parts of Clear Creek, Gilpin, Boulder, and Grand counties, Colorado. Covers parts of the Central City, Empire, Nederland, and East Portal quadrangles, Colorado.45 x 35 cmmine mapsengMines and mineral resources -- Colorado -- Clear Creek County -- MapsMines and mineral resources -- Colorado -- Gilpin County -- MapsMines and mineral resources -- Colorado -- Boulder County -- MapsMines and mineral resources -- Colorado – Grand County -- MapsStillImage