@misc{indiciaecaf83ee10cdd,
  title = {Reconnaissance geologic map of the Beulah Quadrangle, Pueblo County, Colorado},
  author = {G. R. Scott and R. B. Taylor},
  year = {1973},
  doi = {10.3133/mf551},
  url = {https://pubs.usgs.gov/publication/mf551},
  note = {Source identifier: mf551}
}