@misc{indiciae63df49dd5951,
  title = {Contour of bedrock surface, Boone to Fowler, Colorado},
  author = {R. Theodore Hurr and J.E. Moore and David B. Richards},
  year = {1966},
  doi = {10.3133/ofr6666},
  url = {https://pubs.usgs.gov/publication/ofr6666},
  note = {Source identifier: ofr6666}
}