@misc{indiciae48ec0b1faa04,
  title = {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},
  author = {A.C. Austin},
  year = {1971},
  doi = {10.3133/mf309},
  url = {https://pubs.usgs.gov/publication/mf309},
  note = {Source identifier: mf309}
}