@misc{indiciae964145231ac4,
  title = {Stratigraphy and refractory clayrocks of the Dakota group along the northern Front Range, Colorado},
  author = {Karl M. Waage},
  year = {1961},
  doi = {10.3133/b1102},
  url = {https://pubs.usgs.gov/publication/b1102},
  note = {Source identifier: b1102}
}