@misc{indiciae8bff006ad86b,
  title = {Bouguer gravity anomaly map of the northern Michigan-Lake Superior region},
  author = {J. S. Klasner and R. J. Wold and W. J. Hinze and L. O. Bacon and N. W. O’Hara and J. M. Berkson},
  year = {1978},
  doi = {10.3133/ofr78211},
  url = {https://pubs.usgs.gov/publication/ofr78211},
  note = {Source identifier: ofr78211}
}