@misc{indiciae689e37d459a4,
  title = {National Research Program of the Water Resources Division, U.S. Geological Survey, fiscal year 1991},
  author = {Martha L. Nichols and Linda C. Friedman},
  year = {1991},
  doi = {10.3133/ofr9238},
  url = {https://pubs.usgs.gov/publication/ofr9238},
  note = {Source identifier: ofr9238}
}