@misc{indiciae3b687d1abf3e,
  title = {Index of analyses of natural waters in the United States},
  author = {W. D. Collins and C. S. Howard},
  year = {1925},
  doi = {10.3133/wsp560c},
  url = {https://pubs.usgs.gov/publication/wsp560C},
  note = {Source identifier: wsp560C}
}