@misc{indiciaed4600d118494,
  title = {The digital geologic map of Colorado in ARC/INFO format, Part B. Command files},
  author = {Gregory N. Green},
  year = {1992},
  doi = {10.3133/ofr92507b},
  url = {https://pubs.usgs.gov/publication/ofr92507B},
  note = {Source identifier: ofr92507B}
}