@misc{indiciae686614d59770,
  title = {Aeromagnetic map of the Delaware quadrangle, Keweenaw County, Michigan},
  author = {James R. Balsley and J. L. Meuschke and Jean Blanchett},
  year = {1963},
  doi = {10.3133/gp315},
  url = {https://pubs.usgs.gov/publication/gp315},
  note = {Source identifier: gp315}
}