@misc{indiciae7cd8233f2f13,
  title = {Maps for America: Cartographic products of the U.S. Geological Survey and others},
  author = {Morris M. Thompson},
  year = {1979},
  doi = {10.3133/70045412},
  url = {https://pubs.usgs.gov/publication/70045412},
  note = {Source identifier: 70045412}
}