@misc{indiciae2de0d0731f1c,
  title = {Preliminary geologic map of the Grand Gulch Bench Quadrangle, Mohave County, Arizona},
  author = {Ivo Lucchitta and L. Sue Beard},
  year = {1981},
  doi = {10.3133/ofr811321},
  url = {https://pubs.usgs.gov/publication/ofr811321},
  note = {Source identifier: ofr811321}
}