@misc{indiciaedabcff6f0405,
  title = {Interpretation of an aerial radiometric survey of the San Gorgonio Wilderness Area and vicinity, San Bernardino County, California},
  author = {James A. Pitkin and Joseph S. Duval},
  year = {1981},
  doi = {10.3133/mf1161b},
  url = {https://pubs.usgs.gov/publication/mf1161B},
  note = {Source identifier: mf1161B}
}