@misc{indiciae0d781c31e210,
  title = {Bedrock geologic map showing the configuration of the bedrock surface, McCook 1 degree by 2 degrees Quadrangle, Nebraska and Kansas, and part of the Sterling 1 degree by 2 degrees Quadrangle, Nebraska and Colorado},
  author = {D.A. Eversoll and V. H. Dreeszen and R.R. Burchett and G.E. Prichard},
  year = {1988},
  doi = {10.3133/i1878},
  url = {https://pubs.usgs.gov/publication/i1878},
  note = {Source identifier: i1878}
}