Pikes Peak, Plum Creek and South Platte forest reserves, showing density of forests / John G. Jack ; [for the] U.S. Geological Survey.
Photocopy and negative made. Relief shown by contours and spot heights. "U.S.G.S.--20th Annual Report, Part 5, Plate 8." Legend lower left--shows mines, camps, ranches (including Hartsells Ranch), sawmills, wagon and lumber roads and railroads. Shows South Park, Colorado.
Washington, D.C. ; U.S. Geological Survey, (New York : 1898,
G4312 .P48 1898 .U5G4 .J3