@misc{indiciaeb9ab8e8d7f9c,
  title = {United States base map},
  author = {U.S. Geological Survey and U.S. Coast and Geodetic Survey},
  year = {1960},
  doi = {10.3133/70277044},
  url = {https://pubs.usgs.gov/publication/70277044},
  note = {Source identifier: 70277044}
}