@misc{indiciae602224c1eb83,
  title = {Aeromagnetic map of Michigan and the adjacent Great Lakes},
  author = {Isidore Zietz and J.R. Kirby and W. J. Hinze and N. W. O’Hara and R.L. Kellogg},
  year = {1974},
  doi = {10.3133/gp894},
  url = {https://pubs.usgs.gov/publication/gp894},
  note = {Source identifier: gp894}
}