@misc{indiciaeec457b544fad,
  title = {Concentration of minor elements in California streams, 1960-69},
  author = {W. D. Silvey},
  year = {1971},
  doi = {10.3133/ofr71258},
  url = {https://pubs.usgs.gov/publication/ofr71258},
  note = {Source identifier: ofr71258}
}