@misc{indiciaeaecb589dc9bb,
  title = {New ages for intrusive rocks in the Colorado mineral belt},
  author = {Charles G. Cunningham and Charles W. Naeser and Richard F. Marvin},
  year = {1977},
  doi = {10.3133/ofr77573},
  url = {https://pubs.usgs.gov/publication/ofr77573},
  note = {Source identifier: ofr77573}
}