@misc{indiciae5ca7f41bd3a9,
  title = {Assessment of stream quality using biological indices at selected sites in the Delaware River basin, Chester County, Pennsylvania, 1981-97},
  author = {Andrew G. Reif},
  year = {2002},
  doi = {10.3133/fs11602},
  url = {https://pubs.usgs.gov/publication/fs11602},
  note = {Source identifier: fs11602}
}