@misc{indiciaee472e5144aa7,
  title = {An evaluation of the effects of acid rain on low conductivity headwater streams in Pennsylvania},
  author = {John R. Ritter and Ann E. Brown},
  year = {1981},
  doi = {10.3133/ofr811025},
  url = {https://pubs.usgs.gov/publication/ofr811025},
  note = {Source identifier: ofr811025}
}