@misc{indiciaed2b0a152a127,
  title = {The Quaternary geology of southeastern Wisconsin, with a chapter on the older rock formations},
  author = {W. C. Alden},
  year = {1918},
  doi = {10.3133/pp106},
  url = {https://pubs.usgs.gov/publication/pp106},
  note = {Source identifier: pp106}
}