@misc{indiciae8992faea0d0d,
  title = {Bouguer gravity map of the Petersburg quadrangle and parts of the Port Alexander, Sitka, and Sumdum quadrangles, Alaska},
  author = {D.F. Barnes and D. A. Brew and R. L. Morin},
  year = {1989},
  doi = {10.3133/mf1970a},
  url = {https://pubs.usgs.gov/publication/mf1970A},
  note = {Source identifier: mf1970A}
}