@misc{indiciae592f4af00a35,
  title = {Preconstruction and postconstruction ground-water levels, Lock and Dam 4, Red River Valley, Louisiana},
  author = {A. H. Ludwig and J.E. Reed},
  year = {1979},
  doi = {10.3133/ofr79921},
  url = {https://pubs.usgs.gov/publication/ofr79921},
  note = {Source identifier: ofr79921}
}