@misc{indiciae14f795f593bb,
  title = {Aeromagnetic map of Frederick County, Maryland},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1974},
  doi = {10.3133/ofr74206},
  url = {https://pubs.usgs.gov/publication/ofr74206},
  note = {Source identifier: ofr74206}
}