TY - RPRT TI - Preliminary geologic map of the west half of the Thirteenmile Creek Quadrangle, Rio Blanco and Garfield counties, Colorado AU - R. B. O'Sullivan AU - M. C. Smith PY - 1985 DO - 10.3133/mf1789 UR - https://pubs.usgs.gov/publication/mf1789 ID - mf1789 ER -