@misc{indiciae20f5c0c485d7,
  title = {Digital orthophotos},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1993},
  doi = {10.3133/70039180},
  url = {https://pubs.usgs.gov/publication/70039180},
  note = {Source identifier: 70039180}
}