Highly detailed General Land Office map of Colorado, 3 years after it became a state in 1876.
One of the dominant features of the map are the areas shaded in red, showing Military Reservations, Indian Reservations and Private Grants.
The map shows land offices, surveyed townships railroads and land grants to the railroad lines.
The map was issued at the time the time when gold and silver were being discovered in the southwestern part of the state, in the areas around Silverton and Ouray. Pre-dates the appearance of Telluride on the map (which was founded as Columbia in 1878) and would not be formally named until 1887.