@misc{indiciae30e7bc1a9420,
  title = {Aeromagnetic map of part of the Beechwood quadrangle, Michigan and Wisconsin},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/gp603},
  url = {https://pubs.usgs.gov/publication/gp603},
  note = {Source identifier: gp603}
}