@misc{indiciae80a208d539c6,
  title = {Geologic map of the Lake Mathews 7.5' quadrangle, Riverside County, California},
  author = {Douglas M. Morton and F. Harold Weber},
  year = {2001},
  doi = {10.3133/ofr01479},
  url = {https://pubs.usgs.gov/publication/ofr01479},
  note = {Source identifier: ofr01479}
}