2018-06-152022-02-032018-06-152022-02-03https://hdl.handle.net/11124/172389Mine report no. 927.Includes maps.Two maps dated 1914; one map dated 1933.reportsengIn copyright - non-commercial use permitted (http://rightsstatements.org/vocab/InC-NC/1.0/).Mines and mineral resources -- Colorado -- Boulder CountyGrand Island Mining District (Colo.)Text