Topographical & township map of part of the State of Colorado : exhibiting the San Juan, Gunnison & California mining regions ; compiled from U.S. Government surveys & other authentic sources / by Louis Nell, Civil Engineer. Stone & Co. General Agents. Denver
Alt. title from cover. "Note: This is an advance sheet of a Map of the whole State of Colorado which will be published sometime during the month of June 1880." Prime meridian: GM. Relief: hachures. Graphic Scale: Miles. Projection: Polyconic. Printing Process: Lithography.
1 map ; hand col. ; 51 x 66 cm., sheet 66 x 73 cm.