@misc{indiciaee11a03b11c38,
  title = {Radium and radon in ground water in the Chickies Quartzite, southeastern Pennsylvania},
  author = {L.A. Senior and K.L. Vogel},
  year = {1995},
  doi = {10.3133/wri924088},
  url = {https://pubs.usgs.gov/publication/wri924088},
  note = {Source identifier: wri924088}
}