@misc{indiciae54276884f5b0,
  title = {Ages of selected intrusive rocks and associated ore deposits in the Colorado mineral belt},
  author = {Charles G. Cunningham and C. W. Naeser and R. F. Marvin and R. G. Luedke and A. R. Wallace},
  year = {1994},
  doi = {10.3133/b2109},
  url = {https://pubs.usgs.gov/publication/b2109},
  note = {Source identifier: b2109}
}