@misc{indiciae183da4d68d69,
  title = {Raster dataset showing the probability of elevated concentrations of nitrate in ground water in Colorado, hydrogeomorphic regions and fertilizer use estimates included},
  author = {Michael G. Rupert},
  year = {2003},
  doi = {10.3133/ofr03234},
  url = {https://pubs.usgs.gov/publication/ofr03234},
  note = {Source identifier: ofr03234}
}