@misc{indiciaeeb2237b39298,
  title = {Preliminary geologic map of Rock School Quadrangle, Rio Blanco County, Colorado},
  author = {D.C. Duncan},
  year = {1976},
  doi = {10.3133/mf757},
  url = {https://pubs.usgs.gov/publication/mf757},
  note = {Source identifier: mf757}
}