@misc{indiciae6a70fcd6abbe,
  title = {Aeromagnetic map of parts of the Matchwood, Ontonagon, Rockland and Greenland quadrangles, Ontonagon County, Michigan},
  author = {James R. Balsley and John R. Kirby},
  year = {1964},
  doi = {10.3133/ofr646},
  url = {https://pubs.usgs.gov/publication/ofr646},
  note = {Source identifier: ofr646}
}