@misc{indiciae301a749ca549,
  title = {Preliminary map showing the estimated potential yields of the Little Muddy aquifer, Williams County, North Dakota},
  author = {Earl A. Ackroyd},
  year = {1967},
  doi = {10.3133/ofr671},
  url = {https://pubs.usgs.gov/publication/ofr671},
  note = {Source identifier: ofr671}
}