@misc{indiciaed155fe958fe3,
  title = {Alkalic rocks and resources of thorium and associated elements in the Powderhorn District, Gunnison County, Colorado},
  author = {J. C. Olson and D. C. Hedlund},
  year = {1981},
  doi = {10.3133/pp1049c},
  url = {https://pubs.usgs.gov/publication/pp1049C},
  note = {Source identifier: pp1049C}
}