@misc{indiciaed3a7a87eee50,
  title = {Downhole pumps for water sampling in small diameter wells},
  author = {F. C. Koopman},
  year = {1979},
  doi = {10.3133/ofr791264},
  url = {https://pubs.usgs.gov/publication/ofr791264},
  note = {Source identifier: ofr791264}
}