@misc{indiciaeb5ed6c76c96e,
  title = {Geology of the Aspen 15-minute quadrangle, Pitkin and Gunnison counties, Colorado},
  author = {Bruce Bryant},
  year = {1979},
  doi = {10.3133/pp1073},
  url = {https://pubs.usgs.gov/publication/pp1073},
  note = {Source identifier: pp1073}
}