@misc{indiciaeb6be4a062516,
  title = {Uranium and thorium in Precambrian crystalline rocks of the Medicine Bow Mountains, north-central Colorado},
  author = {M. E. McCallum and A.L. Burch},
  year = {1980},
  doi = {10.3133/ofr80458},
  url = {https://pubs.usgs.gov/publication/ofr80458},
  note = {Source identifier: ofr80458}
}