@misc{indiciaeff15be6d10d9,
  title = {Map showing appraisal of mineral resource potential of RARE II proposed roadless areas in National forests, Colorado (exclusive of coal, oil, gas, and construction materials)},
  author = {Ogden Tweto and Thomas August Steven},
  year = {1978},
  doi = {10.3133/ofr78894},
  url = {https://pubs.usgs.gov/publication/ofr78894},
  note = {Source identifier: ofr78894}
}