@misc{indiciae151dff5def13,
  title = {Airborne gamma-ray spectrometry and aeromagnetic survey of the Freer area in Duval, Live Oak, McMullen, and Webb counties, Texas},
  author = {Karen A. Schulz},
  year = {1975},
  doi = {10.3133/ofr75294},
  url = {https://pubs.usgs.gov/publication/ofr75294},
  note = {Source identifier: ofr75294}
}