@misc{indiciae9f5b787e61bf,
  title = {Uranium and radium in ground waters of the Llano Estacado, Texas and New Mexico},
  author = {F. B. Barker and R. C. Scott},
  year = {1957},
  doi = {10.3133/ofr576},
  url = {https://pubs.usgs.gov/publication/ofr576},
  note = {Source identifier: ofr576}
}