@misc{indiciae36d08a5ad2cf,
  title = {Generalized surficial geologic map of the Denver area, Colorado},
  author = {G.H. Chase and J.A. McConaghy},
  year = {1972},
  doi = {10.3133/i731},
  url = {https://pubs.usgs.gov/publication/i731},
  note = {Source identifier: i731}
}