@misc{indiciaed8ecaadd0f19,
  title = {Geologic map of Texas},
  author = {N. H. Darton and L. W. Stephenson and Julia Gardner},
  year = {1937},
  doi = {10.3133/70210881},
  url = {https://pubs.usgs.gov/publication/70210881},
  note = {Source identifier: 70210881}
}