@misc{indiciae6b98efa5be7b,
  title = {Aeromagnetic survey of parts of the Sturgeon Bay and Crystal Lake 1:100,000 quadrangles, Wisconsin and Michigan},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/ofr99526n},
  url = {https://pubs.usgs.gov/publication/ofr99526N},
  note = {Source identifier: ofr99526N}
}