@misc{indiciae33cf32a59d73,
  title = {Proterozoic gold, silver, copper, lead, zinc, and tungsten deposits and occurrences in Colorado, an experimental publication on 5 1/4 inch disk for microcomputers that use the DOS operating system},
  author = {R. B. Taylor and D. M. Sheridan and G.I. Selner},
  year = {1987},
  doi = {10.3133/ofr8799},
  url = {https://pubs.usgs.gov/publication/ofr8799},
  note = {Source identifier: ofr8799}
}