@misc{indiciae1ad2fb7e144e,
  title = {Water sediment, and nutrient budgets, and bathymetric survey of Old and New Gillespie Lakes, Macoupin County, Illinois, May 1996-April 1997; with a discussion of lake-management practices},
  author = {Gary P. Johnson},
  year = {1999},
  doi = {10.3133/ofr9969},
  url = {https://pubs.usgs.gov/publication/ofr9969},
  note = {Source identifier: ofr9969}
}