@misc{indiciaef2fa726a4b3b,
  title = {Native and contaminated ground waters in the Long Beach-Santa Ana area, California},
  author = {Arthur M. Piper and A. A. Garrett},
  year = {1953},
  doi = {10.3133/wsp1136},
  url = {https://pubs.usgs.gov/publication/wsp1136},
  note = {Source identifier: wsp1136}
}