TY - RPRT TI - Spatial geologic data model for the Gunnison, Grand Mesa, Uncompahgre National Forests mineral resource assessment area, southwestern Colorado and digital data for the Leadville, Montrose, Durango, and Colorado parts of the Grand Junction, Moab, and Cortez 1° x 2° geologic maps AU - W. C. Day AU - G.N. Green AU - D. H. Knepper AU - R. C. Phillips PY - 1999 DO - 10.3133/ofr99427 UR - https://pubs.usgs.gov/publication/ofr99427 ID - ofr99427 ER -