@misc{indiciae86f5097284a8,
  title = {Definition of Wisconsinan Stage},
  author = {John Chapman Frye and H.B. Willman and Meyer Rubin and R. F. Black},
  year = {1968},
  doi = {10.3133/b1274e},
  url = {https://pubs.usgs.gov/publication/b1274E},
  note = {Source identifier: b1274E}
}