TY - RPRT TI - Geologic map of the Leadville 1 degree by 2 degrees Quadrangle, northwestern Colorado AU - Ogden Tweto AU - R. H. Moench AU - J. C. Reed PY - 1978 DO - 10.3133/i999 UR - https://pubs.usgs.gov/publication/i999 ID - i999 ER -