@misc{indiciae642a2bf78718,
  title = {US Topo: Topographic Maps for the Nation},
  author = {Patricia L. Hytes},
  year = {2009},
  doi = {10.3133/fs20093108},
  url = {https://pubs.usgs.gov/publication/fs20093108},
  note = {Source identifier: fs20093108}
}