@misc{indiciae720cba7cd18b,
  title = {Airborne radiometric and magnetic survey of parts of the Upper Peninsula of Michigan and northern Wisconsin},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1983},
  doi = {10.3133/ofr83195a},
  url = {https://pubs.usgs.gov/publication/ofr83195A},
  note = {Source identifier: ofr83195A}
}