@misc{indiciae4e5d0adc03aa,
  title = {Geology and ore deposits of the Shafter mining district, Presidio County, Texas},
  author = {Clyde Polhemus Ross},
  year = {1943},
  doi = {10.3133/b928b},
  url = {https://pubs.usgs.gov/publication/b928B},
  note = {Source identifier: b928B}
}