@misc{indiciaea7adfdc8bf84,
  title = {Index of flood maps prepared by the U.S. Geological Survey through 1973},
  author = {Philip Hadley Carrigan},
  year = {1974},
  doi = {10.3133/wri7357},
  url = {https://pubs.usgs.gov/publication/wri7357},
  note = {Source identifier: wri7357}
}