@misc{indiciae49d9c60cb7ca,
  title = {Reconnaissance map showing relative amounts of soil and bedrock in the mountainous part of the Cascade Quadrangle, El Paso County, Colorado},
  author = {P. W. Schmidt},
  year = {1979},
  doi = {10.3133/mf1064},
  url = {https://pubs.usgs.gov/publication/mf1064},
  note = {Source identifier: mf1064}
}