@misc{indiciae5c80449fd5f0,
  title = {Nitrate concentrations in ground water in the paleovalley alluvial aquifers of the Nemaha Natural Resources District, Nebraska, 1989 and 1994-96},
  author = {A. H. Chen},
  year = {1998},
  doi = {10.3133/wri984106},
  url = {https://pubs.usgs.gov/publication/wri984106},
  note = {Source identifier: wri984106}
}