@misc{indiciaec91e4d646b38,
  title = {Ground-water resources and geology of Niobrara County, Wyoming, with a section on chemical quality of the ground water},
  author = {Harold A. Whitcomb and T. Ray Cummings},
  year = {1965},
  doi = {10.3133/wsp1788},
  url = {https://pubs.usgs.gov/publication/wsp1788},
  note = {Source identifier: wsp1788}
}