@misc{indiciaeb71a2fbd77bc,
  title = {How to obtain aerial photographs},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1997},
  doi = {10.3133/fs14097},
  url = {https://pubs.usgs.gov/publication/fs14097},
  note = {Source identifier: fs14097}
}