@misc{indiciae53692d34b4e4,
  title = {Description of the Madison Aquifer study, Montana, North Dakota, South Dakota, and Wyoming},
  author = {E. M. Cushing},
  year = {1977},
  doi = {10.3133/ofr77514},
  url = {https://pubs.usgs.gov/publication/ofr77514},
  note = {Source identifier: ofr77514}
}