@misc{indiciaeb734ee0d5c48,
  title = {Index of analyses of natural waters in the United States, 1926 to 1931},
  author = {W. D. Collins and C. S. Howard},
  year = {1932},
  doi = {10.3133/wsp659c},
  url = {https://pubs.usgs.gov/publication/wsp659C},
  note = {Source identifier: wsp659C}
}