@misc{indiciaee3f18f20efc7,
  title = {Earliest conifers in North America; upland and/or paleoclimatic indicators?},
  author = {Paul C. Lyons and W.C. Darrah},
  year = {1989},
  doi = {10.2307/3514592},
  url = {https://pubs.usgs.gov/publication/70015380},
  note = {Source identifier: 70015380}
}