@misc{indiciae864e56b200fd,
  title = {United States base map},
  author = {U.S. Geological Survey and U.S. Coast and Geodetic Survey},
  year = {1958},
  doi = {10.3133/70276704},
  url = {https://pubs.usgs.gov/publication/70276704},
  note = {Source identifier: 70276704}
}