@misc{indiciae7dd779735162,
  title = {Aeromagnetic map of the Sagola quadrangle and part of the Iron Mountain quadrangle, Dickinson, Iron, and Marquette Counties, Michigan},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/gp611},
  url = {https://pubs.usgs.gov/publication/gp611},
  note = {Source identifier: gp611}
}