@misc{indiciae04d4c73c25cf,
  title = {Preliminary map showing known and suspected active faults in Colorado},
  author = {Irving Jerome Witkind},
  year = {1976},
  doi = {10.3133/ofr76154},
  url = {https://pubs.usgs.gov/publication/ofr76154},
  note = {Source identifier: ofr76154}
}