@misc{indiciae571a0995e02d,
  title = {Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991},
  author = {S. J. Kalkhoff and R.L. Kuzniar},
  year = {1994},
  doi = {10.3133/ofr9456},
  url = {https://pubs.usgs.gov/publication/ofr9456},
  note = {Source identifier: ofr9456}
}