@misc{indiciae640ec88d987b,
  title = {Preliminary geologic map of the Freer SW Quadrangle, Duval County, Texas},
  author = {D. H. Eargle and K. A. Dickinson},
  year = {1974},
  doi = {10.3133/ofr7443},
  url = {https://pubs.usgs.gov/publication/ofr7443},
  note = {Source identifier: ofr7443}
}