@misc{indiciaee647b8aba3a9,
  title = {Aeromagnetic map of Gladstone and vicinity, Delta, Alger, Menominee, and Marquette counties, Michigan},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1972},
  doi = {10.3133/gp833},
  url = {https://pubs.usgs.gov/publication/gp833},
  note = {Source identifier: gp833}
}