@misc{indiciaec396dbf11b16,
  title = {Use of track detectors for the evaluation of emanating radium content of soil samples.},
  author = {E. R. Landa and K.K. Nielson},
  year = {1987},
  url = {https://pubs.usgs.gov/publication/70014099},
  note = {Source identifier: 70014099}
}