@misc{indiciae403d154e2b91,
  title = {Senegal River Valley Ground-Water Monitoring Project; summary report on piezometer evaluation, February-March 1989},
  author = {E.L. Bolke and J.C. Stephens},
  year = {1989},
  doi = {10.3133/ofr89411},
  url = {https://pubs.usgs.gov/publication/ofr89411},
  note = {Source identifier: ofr89411}
}