@misc{indiciae60916b304879,
  title = {Geologic map of the Valley Mountain 15’ quadrangle, San Bernardino and Riverside Counties, California},
  author = {Keith A. Howard and John Bacheller and Todd T. Fitzgibbon and Robert E. Powell and Charlotte M. Allen},
  year = {2013},
  doi = {10.3133/gq1767},
  url = {https://pubs.usgs.gov/publication/gq1767},
  note = {Source identifier: gq1767}
}