@misc{indiciae2ac0488b0d81,
  title = {Instream flow assessment and economic valuation: a survey of nonmarket benefits research},
  author = {Aaron J. Douglas and Richard L. Johnson},
  year = {1993},
  doi = {10.1080/00207239308710816},
  url = {https://pubs.usgs.gov/publication/70128769},
  note = {Source identifier: 70128769}
}