@misc{indiciae15512884aedd,
  title = {Chemical, spectrographic, and modal analyses of syenitic rocks, thorium veins, and carbonatite in the Powderhorn District, Gunnison County, Colorado},
  author = {David Carl Hedlund and Jerry Chipman Olson},
  year = {1980},
  doi = {10.3133/ofr80233},
  url = {https://pubs.usgs.gov/publication/ofr80233},
  note = {Source identifier: ofr80233}
}