@misc{indiciaeca147a122d84,
  title = {Machine-readable data files from the Madison Limestone and northern Great Plains regional aquifer system analysis projects, Montana, Nebraska, North Dakota, South Dakota, and Wyoming},
  author = {J. S. Downey},
  year = {1982},
  doi = {10.3133/wri824107},
  url = {https://pubs.usgs.gov/publication/wri824107},
  note = {Source identifier: wri824107}
}