@misc{indiciae170462307b4b,
  title = {Map showing structure of the continental terrace in the Port Isabel 1 degree x 2 degrees quadrangle, Texas},
  author = {H. L. Berryhill and A. R. Trippet},
  year = {1980},
  doi = {10.3133/i1254f},
  url = {https://pubs.usgs.gov/publication/i1254F},
  note = {Source identifier: i1254F}
}