@misc{indiciaed524e8a532e7,
  title = {Maps showing bedrock topography of Lake Superior},
  author = {Richard J. Wold},
  year = {1979},
  doi = {10.3133/mf1174},
  url = {https://pubs.usgs.gov/publication/mf1174},
  note = {Source identifier: mf1174}
}