1 map ; on sheet 92 x 76 cm.
Ouray Mining District [Ouray County], Colo. / Department of the Interior, U.S. Geological Survey; W.H. Herron, Division Engineer; topography by C.A. Ecklund ; control by U.S. Geological Survey; surveyed in 1927.
Alternate title: Colorado (Ouray County), Ouray Mining District (North of latitude 38?p0?s) Photocopy, brown-line. Relief shown by contours and spot heights. "Advance sheet. Subject to correction." Shows mining activity.
[Washington, D.C.] : The Survey, 1927.