@misc{indiciaec880f2630a35,
  title = {Revisions of Ulmus and Zelkova in the middle and late Tertiary of western North America},
  author = {Toshimasa Tanai and Jack A. Wolfe},
  year = {1977},
  doi = {10.3133/pp1026},
  url = {https://pubs.usgs.gov/publication/pp1026},
  note = {Source identifier: pp1026}
}