@misc{indiciae9e41bfc89dc8,
  title = {Summary of ground-water hydrological data in Michigan in 1969},
  author = {P.R. Giroux and G.C. Huffman},
  year = {1970},
  doi = {10.3133/ofr70136},
  url = {https://pubs.usgs.gov/publication/ofr70136},
  note = {Source identifier: ofr70136}
}