@misc{indiciae8068a1a23f33,
  title = {Occurrence of minor elements in water},
  author = {W. H. Durum and Joseph Haffty},
  year = {1961},
  doi = {10.3133/cir445},
  url = {https://pubs.usgs.gov/publication/cir445},
  note = {Source identifier: cir445}
}