@misc{indiciaed6cfcf57f3a4,
  title = {Glacial map of Ohio},
  author = {R. P. Goldthwait and G. W. White and J. L. Forsyth},
  year = {1967},
  doi = {10.3133/i316},
  url = {https://pubs.usgs.gov/publication/i316},
  note = {Source identifier: i316}
}