@misc{indiciae25109f666e5e,
  title = {Discover the many types of maps available from the U.S. Geological Survey},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/70039191},
  url = {https://pubs.usgs.gov/publication/70039191},
  note = {Source identifier: 70039191}
}