@misc{indiciae6201ec6841a3,
  title = {Chapter A4. Collection of water samples},
  author = {U.S. Geological Survey},
  year = {2006},
  doi = {10.3133/twri09a4},
  url = {https://pubs.usgs.gov/publication/twri09A4},
  note = {Source identifier: twri09A4}
}