@misc{indiciae893fb63895dd,
  title = {The determination of thorium in high grade and low grade ores},
  author = {F. S. Grimaldi and Charlotte A. March},
  year = {1947},
  doi = {10.3133/tei44},
  url = {https://pubs.usgs.gov/publication/tei44},
  note = {Source identifier: tei44}
}