@misc{indiciae198b9e4941ba,
  title = {Generalized map showing Precambrian rocks and metamorphic facies, keyed to aluminosilicate minerals in meta-shales with excess alumina, northern Park Range, Colorado},
  author = {George L. Snyder},
  year = {1980},
  doi = {10.3133/ofr80787},
  url = {https://pubs.usgs.gov/publication/ofr80787},
  note = {Source identifier: ofr80787}
}