@misc{indiciae40c49ee9fdf9,
  title = {Limnological survey of Sacony Creek Basin, Berks County, Pennsylvania},
  author = {James L. Barker and Kenneth P. Kulp},
  year = {1976},
  doi = {10.3133/wri7684},
  url = {https://pubs.usgs.gov/publication/wri7684},
  note = {Source identifier: wri7684}
}