@misc{indiciae03f644514d55,
  title = {Bouguer gravity map of the Bangor 1° x 2° quadrangle, Maine},
  author = {Robert W. Simpson and Wallace A. Bothner and Dennis S. Hodge},
  year = {1979},
  doi = {10.3133/ofr79755},
  url = {https://pubs.usgs.gov/publication/ofr79755},
  note = {Source identifier: ofr79755}
}