@misc{indiciaea08e4bb3bc11,
  title = {Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91},
  author = {Edward H. Koerkle and Linda C. Gustafson-Minnich and Michael D. Bilger},
  year = {1997},
  doi = {10.3133/wri974048},
  url = {https://pubs.usgs.gov/publication/wri974048},
  note = {Source identifier: wri974048}
}