@misc{indiciae2561adb87933,
  title = {Land use/land cover and environmental photointerpretation keys},
  author = {George L. Loelkes and G.E. Howard and E.I. Schwertz and P.D. Lampert and S.W. Miller},
  year = {1983},
  doi = {10.3133/b1600},
  url = {https://pubs.usgs.gov/publication/b1600},
  note = {Source identifier: b1600}
}