@misc{indiciae86f5d5aac699,
  title = {Progress report on geologic investigation of the Yuma area and the East Mesa area of Imperial Valley},
  author = {F. H. Olmsted and J. H. Robison},
  year = {1964},
  doi = {10.3133/ofr64120},
  url = {https://pubs.usgs.gov/publication/ofr64120},
  note = {Source identifier: ofr64120}
}