@misc{indiciae71c31a1ee93f,
  title = {Reconnaissance map showing relative amounts of soil and bedrock in the mountainous part of the Eldorado Springs quadrangle, Boulder and Jefferson Counties, Colorado},
  author = {K. L. Pierce and P. W. Schmidt},
  year = {1975},
  doi = {10.3133/mf695},
  url = {https://pubs.usgs.gov/publication/mf695},
  note = {Source identifier: mf695}
}