@misc{indiciae3908df17ef52,
  title = {Stratigraphy and structure of some Keweenawan rocks, Michigan},
  author = {Harold Arthur Hubbard},
  year = {1968},
  doi = {10.3133/ofr68141},
  url = {https://pubs.usgs.gov/publication/ofr68141},
  note = {Source identifier: ofr68141}
}