@misc{indiciae3f03cad7b6e0,
  title = {Surface-water quality, Twin Ponies watershed, Pottawattamie and Mills Counties, Iowa},
  author = {Mark G. Detroy},
  year = {1981},
  doi = {10.3133/ofr81679},
  url = {https://pubs.usgs.gov/publication/ofr81679},
  note = {Source identifier: ofr81679}
}