@misc{indiciaec9928f82aaee,
  title = {Coherent changes in relative C4 plant productivity and climate during the late Quaternary in the North American Great Plains},
  author = {L. Nordt and J. Von Fischer and L. Tieszen and J. Tubbs},
  year = {2008},
  doi = {10.1016/j.quascirev.2008.05.008},
  url = {https://pubs.usgs.gov/publication/70000306},
  note = {Source identifier: 70000306}
}