@misc{indiciae50d42781586f,
  title = {Geohydrology of the Madison and associated aquifers in parts of Montana, North Dakota, South Dakota, and Wyoming},
  author = {J. S. Downey},
  year = {1984},
  doi = {10.3133/pp1273g},
  url = {https://pubs.usgs.gov/publication/pp1273G},
  note = {Source identifier: pp1273G}
}