@misc{indiciae463ec1c5269a,
  title = {Topographic map symbols},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2005},
  doi = {10.3133/70039164},
  url = {https://pubs.usgs.gov/publication/70039164},
  note = {Source identifier: 70039164}
}