@misc{indiciae92298435bced,
  title = {Geologic and geophysical maps of the El Casco 7.5′ quadrangle, Riverside County, southern California, with accompanying geologic-map database},
  author = {J. C. Matti and D. M. Morton and V. E. Langenheim},
  year = {2015},
  doi = {10.3133/ofr20101274},
  url = {https://pubs.usgs.gov/publication/ofr20101274},
  note = {Source identifier: ofr20101274}
}