@misc{indiciaea4ff412807b2,
  title = {Method for determination of small amounts of rare earths and thorium in phosphate rocks},
  author = {C. L. Waring and H. Mela},
  year = {1953},
  url = {https://pubs.usgs.gov/publication/70011089},
  note = {Source identifier: 70011089}
}