@misc{indiciaea33eaf0e2ee6,
  title = {Stratigraphy of the Dakota group along the northern Front Range foothills, Colorado},
  author = {Karl M. Waage},
  year = {1959},
  doi = {10.3133/oc60},
  url = {https://pubs.usgs.gov/publication/oc60},
  note = {Source identifier: oc60}
}