@misc{indiciaec97f3a9fb5e6,
  title = {Geology, altitude, and depth of the bedrock surface beneath the Ogallala Formation in the northern High Plains of Colorado},
  author = {Ronald G. Borman and Thomas S. Meredith},
  year = {1983},
  doi = {10.3133/ha669},
  url = {https://pubs.usgs.gov/publication/ha669},
  note = {Source identifier: ha669}
}