@misc{indiciae90476cff30bc,
  title = {Digital geologic map of the Butler Peak 7.5' quadrangle, San Bernardino County, California},
  author = {Fred K. Miller and Jonathan C. Matti and Howard J. Brown and Digital preparation by P. M. Cossette},
  year = {2000},
  doi = {10.3133/ofr00145},
  url = {https://pubs.usgs.gov/publication/ofr00145},
  note = {Source identifier: ofr00145}
}