@misc{indiciae35af5a6d2bb1,
  title = {Pre-Cambrian rocks of the Lake Superior region: A review of newly discovered geologic features, with a revised geologic map},
  author = {C. K. Leith and R. J. Lund and Andrew Leith},
  year = {1935},
  doi = {10.3133/pp184},
  url = {https://pubs.usgs.gov/publication/pp184},
  note = {Source identifier: pp184}
}