@misc{indiciaebdb7bc365199,
  title = {Preliminary geologic map of the Guffey Quadrangle, Park County, Colorado},
  author = {Rudy C. Epis and R. A. Wobus and Glenn R. Scott},
  year = {1979},
  doi = {10.3133/ofr79426},
  url = {https://pubs.usgs.gov/publication/ofr79426},
  note = {Source identifier: ofr79426}
}