@misc{indiciae35f851fd4fb8,
  title = {Nitrogen and phosphorus data for surface water in the Upper Colorado River basin, Colorado, 1980-94},
  author = {K. H. Wynn and N.E. Spahr},
  year = {1997},
  doi = {10.3133/ofr97233},
  url = {https://pubs.usgs.gov/publication/ofr97233},
  note = {Source identifier: ofr97233}
}