@misc{indiciaeac22f8b20c23,
  title = {United States base map},
  author = {U.S. Geological Survey and U.S. Coast and Geodetic Survey},
  year = {1966},
  doi = {10.3133/70276682},
  url = {https://pubs.usgs.gov/publication/70276682},
  note = {Source identifier: 70276682}
}