@misc{indiciaeae15af20e652,
  title = {Environments of northwestern North America before the last glacial maximum},
  author = {John J. Clague and Rolf Mathewes and Thomas A. Ager},
  year = {2004},
  url = {https://pubs.usgs.gov/publication/70228941},
  note = {Source identifier: 70228941}
}