@misc{indiciae885368811825,
  title = {Preliminary geologic map of the Olaf Knolls Quadrangle, Mohave County, Arizona},
  author = {Ivo Lucchitta and L. Sue Beard},
  year = {1981},
  doi = {10.3133/ofr811322},
  url = {https://pubs.usgs.gov/publication/ofr811322},
  note = {Source identifier: ofr811322}
}