@misc{indiciaeb7a1940b1b2a,
  title = {The Marquette Range Supergroup in the Gogebic iron district, Michigan and Wisconsin},
  author = {Robert Gordon Schmidt},
  year = {1980},
  doi = {10.3133/b1460},
  url = {https://pubs.usgs.gov/publication/b1460},
  note = {Source identifier: b1460}
}