@misc{indiciae19fa4cb0ca4c,
  title = {Investigations of fluvial sediments of the Niobrara River near Valentine, Nebraska},
  author = {Bruce R. Colby and D.Q. Matejka and David Wellington Hubbell},
  year = {1953},
  doi = {10.3133/cir205},
  url = {https://pubs.usgs.gov/publication/cir205},
  note = {Source identifier: cir205}
}