@misc{indiciae6027343d92c3,
  title = {Aeromagnetic map of the Keweenaw Bay area, Michigan},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/gp608},
  url = {https://pubs.usgs.gov/publication/gp608},
  note = {Source identifier: gp608}
}