@misc{indiciae7c2505c30e48,
  title = {Chemical and physical characteristics of natural ground waters in Michigan: A preliminary report},
  author = {T. Ray Cummings},
  year = {1980},
  doi = {10.3133/ofr80953},
  url = {https://pubs.usgs.gov/publication/ofr80953},
  note = {Source identifier: ofr80953}
}