@misc{indiciaeab6fedea4097,
  title = {Radioactivity of the Chattanooga shale East of the Mississippi River and South of the Ohio River: an interim report},
  author = {J. M. Nelson and K.G. Brill},
  year = {1947},
  doi = {10.3133/tei22},
  url = {https://pubs.usgs.gov/publication/tei22},
  note = {Source identifier: tei22}
}