@misc{indiciae2ffbf536643c,
  title = {Preconstruction and postconstruction ground-water levels, Lock and Dam 2, Red River Valley, Louisiana},
  author = {A. H. Ludwig},
  year = {1979},
  doi = {10.3133/ofr79919},
  url = {https://pubs.usgs.gov/publication/ofr79919},
  note = {Source identifier: ofr79919}
}