General Geological Map of Colorado
USA: Department of Interior, c.1870. Size : 650x888 (mm), 25.59x34.96 (Inches), Coloring: Printed in Color, Category: Maps United States West Colorado; Maps Geological;. Size : 650x888 (mm), 25.59x34.96 (Inches), Coloring: Printed in Color, Category: Maps United States West Colorado; Maps Geological;.