@misc{indiciaea26e6fddb7a4,
  title = {Geology of the Wood and East Calhoun mines, Central City District, Gilpin County, Colorado},
  author = {Avery Ala Drake},
  year = {1955},
  doi = {10.3133/tei175},
  url = {https://pubs.usgs.gov/publication/tei175},
  note = {Source identifier: tei175}
}