@misc{indiciaecf8fcee601a5,
  title = {Aeromagnetic and gravity profiles of the United States along the 37th parallel: A contribution to the upper mantle project},
  author = {Isidore Zietz and J.R. Kirby},
  year = {1967},
  doi = {10.3133/gp597},
  url = {https://pubs.usgs.gov/publication/gp597},
  note = {Source identifier: gp597}
}