@misc{indiciaef13235480239,
  title = {Preliminary geologic map of the Parrilla Creek NW Quadrangle, Duval County, Texas},
  author = {D. H. Eargle and K. A. Dickinson},
  year = {1974},
  doi = {10.3133/ofr7445},
  url = {https://pubs.usgs.gov/publication/ofr7445},
  note = {Source identifier: ofr7445}
}