@misc{indiciae85c798e4e88f,
  title = {Geologic Map of the Elkhorn Quadrangle, Park County, Colorado},
  author = {Chester A. Ruleman and Robert G. Bohannon},
  year = {2008},
  doi = {10.3133/sim3043},
  url = {https://pubs.usgs.gov/publication/sim3043},
  note = {Source identifier: sim3043}
}