@misc{indiciaeaf6e29db119e,
  title = {Reconnaissance map showing relative amounts of soil and bedrock in the mountainous part of the Manitou Springs-Colorado Springs quadrangles El Paso and Teller counties, Colorado},
  author = {P. W. Schmidt},
  year = {1979},
  doi = {10.3133/mf1066},
  url = {https://pubs.usgs.gov/publication/mf1066},
  note = {Source identifier: mf1066}
}