@misc{indiciaec973f3fb7a70,
  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 = {1979},
  doi = {10.3133/gp930},
  url = {https://pubs.usgs.gov/publication/gp930},
  note = {Source identifier: gp930}
}