@misc{indiciaef8279999fee6,
  title = {Preliminary Bouguer gravity map of central Alaska},
  author = {David F. Barnes},
  year = {1977},
  doi = {10.3133/ofr77168c},
  url = {https://pubs.usgs.gov/publication/ofr77168C},
  note = {Source identifier: ofr77168C}
}