@misc{indiciae52f95539fbb3,
  title = {The Copper Harbor Conglomerate (middle Keweenawan) on Isle Royale, Michigan, and its regional implications},
  author = {R.G. Wolff and N.K. Huber},
  year = {1973},
  doi = {10.3133/pp754b},
  url = {https://pubs.usgs.gov/publication/pp754B},
  note = {Source identifier: pp754B}
}