@misc{indiciaefa26d2a36b7e,
  title = {Hydrogeology and subsurface nitrate in the Upper Big Blue Natural Resources District, central Nebraska, July 1995 through September 1997},
  author = {Ingrid M. Verstraeten and Virginia L. McGuire and K. L. Heckman},
  year = {1998},
  doi = {10.3133/wri984207},
  url = {https://pubs.usgs.gov/publication/wri984207},
  note = {Source identifier: wri984207}
}