@misc{indiciaee49675f790f5,
  title = {Natural gamma aeroradioactivity map of the Fort Worth-Dallas area, Texas},
  author = {J. A. Pitkin},
  year = {1970},
  doi = {10.3133/gp696},
  url = {https://pubs.usgs.gov/publication/gp696},
  note = {Source identifier: gp696}
}