@misc{indiciae3420ac7e53a0,
  title = {Engineer Mountain folio, Colorado},
  author = {Whitman Cross and Allen D. Hole},
  year = {1910},
  doi = {10.3133/gf171},
  url = {https://pubs.usgs.gov/publication/gf171},
  note = {Source identifier: gf171}
}