@misc{indiciaec36031f523d0,
  title = {Maps showing trace-element geochemistry of the Sangre de Cristo Wilderness Study Area, south-central Colorado},
  author = {David R. Zimbelman},
  year = {1989},
  doi = {10.3133/mf1635c},
  url = {https://pubs.usgs.gov/publication/mf1635C},
  note = {Source identifier: mf1635C}
}