@misc{indiciae3211c6fb5899,
  title = {Geologic map of the Tilden quadrangle, McMullen County, Texas},
  author = {Kendell A. Dickinson},
  year = {1975},
  doi = {10.3133/gq1246},
  url = {https://pubs.usgs.gov/publication/gq1246},
  note = {Source identifier: gq1246}
}