@misc{indiciae26be01a6db0c,
  title = {Bouguer gravity map of the Presque Isle 1° x 2° quadrangle and parts of adjacent quadrangles, Maine, New Brunswick, and Quebec},
  author = {Robert W. Simpson and Wallace A. Bothner and Dennis S. Hodge},
  year = {1979},
  doi = {10.3133/ofr791081},
  url = {https://pubs.usgs.gov/publication/ofr791081},
  note = {Source identifier: ofr791081}
}