@misc{indiciae8eee2139749e,
  title = {Preliminary geologic map of Yankee Gulch Quadrangle, Rio Blanco County, Colorado},
  author = {D.C. Duncan},
  year = {1976},
  doi = {10.3133/mf758},
  url = {https://pubs.usgs.gov/publication/mf758},
  note = {Source identifier: mf758}
}