TY - RPRT TI - Preliminary 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 - 1976 DO - 10.3133/mf760 UR - https://pubs.usgs.gov/publication/mf760 ID - mf760 ER -