@misc{indiciae1dc3a59e86ed,
  title = {General geology and petrology of the Precambrian crystalline rocks, Park and Jefferson counties, Colorado},
  author = {C. C. Hawley and Reinhard A. Wobus},
  year = {1977},
  doi = {10.3133/pp608b},
  url = {https://pubs.usgs.gov/publication/pp608B},
  note = {Source identifier: pp608B}
}