@misc{indiciae291b5addf43d,
  title = {Preliminary geologic map of the St. Thomas 7.5-minute quadrangle, Clark County, Nevada, and Mohave County, Arizona},
  author = {L. S. Beard},
  year = {1992},
  doi = {10.3133/ofr92326},
  url = {https://pubs.usgs.gov/publication/ofr92326},
  note = {Source identifier: ofr92326}
}