@misc{indiciae02976720d834,
  title = {Geologic maps of lead-zinc mines, Kokomo district, Summit County, Colorado},
  author = {Albert Herbert Koschmann},
  year = {1950},
  doi = {10.3133/ofr5019},
  url = {https://pubs.usgs.gov/publication/ofr5019},
  note = {Source identifier: ofr5019}
}