TY - RPRT TI - Structure contours and overburden on the top of the Mahogany zone, Green River Formation, in the northern part of the Piceance Creek basin, Rio Blanco County, Colorado AU - A.C. Austin PY - 1971 DO - 10.3133/mf309 UR - https://pubs.usgs.gov/publication/mf309 ID - mf309 ER -