@misc{indiciae0399b016a867,
  title = {Geologic and structural maps and sections of the Marshall Pass Mining District, Saguache, Gunnison, and Chaffee counties, Colorado},
  author = {J. C. Olson},
  year = {1983},
  doi = {10.3133/i1425},
  url = {https://pubs.usgs.gov/publication/i1425},
  note = {Source identifier: i1425}
}