@misc{indiciaeb7de4aac5ebd,
  title = {Copper and uranium in Pennsylvanian and Permian sedimentary rocks, northern Sangre de Cristo Range, Colorado},
  author = {David A. Lindsey and Reino F. Clark},
  year = {1995},
  doi = {10.3133/b2116},
  url = {https://pubs.usgs.gov/publication/b2116},
  note = {Source identifier: b2116}
}