@misc{indiciae34ea5408e320,
  title = {Aeromagnetic map of the Hancock quadrangle, Houghton County, Michigan},
  author = {James R. Balsley and J. L. Meuschke and Jean Blanchett},
  year = {1963},
  doi = {10.3133/gp321},
  url = {https://pubs.usgs.gov/publication/gp321},
  note = {Source identifier: gp321}
}