@misc{indiciaebe21f1fb17c6,
  title = {Bristlecone pine frost-ring and light-ring chronologies, from 569 B.C. to A.D. 1993, Colorado},
  author = {F. Craig Brunstein},
  year = {1995},
  doi = {10.3133/ofr9563},
  url = {https://pubs.usgs.gov/publication/ofr9563},
  note = {Source identifier: ofr9563}
}