@misc{indiciaea7c262b0df67,
  title = {Geologic map of the Black Hawk quadrangle, Gilpin, Jefferso,n and Clear Creek Counties, Colorado},
  author = {Richard B. Taylor},
  year = {1976},
  doi = {10.3133/gq1248},
  url = {https://pubs.usgs.gov/publication/gq1248},
  note = {Source identifier: gq1248}
}