@misc{indiciae2f7eec4803ec,
  title = {The National Map: Topographic Maps for the 21st Century},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2001},
  doi = {10.3133/fs10101},
  url = {https://pubs.usgs.gov/publication/fs10101},
  note = {Source identifier: fs10101}
}