@misc{indiciae8a3d4811c8e9,
  title = {Lead and zinc deposits at Rico, Colorado},
  author = {D. J. Varnes and A.H. Wadsworth},
  year = {1944},
  doi = {10.3133/ofr4451},
  url = {https://pubs.usgs.gov/publication/ofr4451},
  note = {Source identifier: ofr4451}
}