@misc{indiciae55ca3371dfa2,
  title = {Historic trail map of the Greeley 1° x 2° quadrangle, Colorado and Wyoming},
  author = {G. R. Scott and C. R. Shwayder},
  year = {1993},
  doi = {10.3133/i2326},
  url = {https://pubs.usgs.gov/publication/i2326},
  note = {Source identifier: i2326}
}