@misc{indiciaef94fccddda5c,
  title = {Analog records from an airborne electromagnetic and magnetic survey of parts of the Upper Peninsula of Michigan and northern Wisconsin [microform]},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/ofr81577b},
  url = {https://pubs.usgs.gov/publication/ofr81577B},
  note = {Source identifier: ofr81577B}
}