@misc{indiciae4e19c5c565c3,
  title = {Assessment of stream quality using biological indices at selected sites in the Big Elk and Octoraro Creek basins, Chester County, Pennsylvania, 1981-97},
  author = {Andrew G. Reif},
  year = {2002},
  doi = {10.3133/fs11502},
  url = {https://pubs.usgs.gov/publication/fs11502},
  note = {Source identifier: fs11502}
}