@misc{indiciaec4e996a20cc5,
  title = {Procedure manual for preparation of satellite image maps: technical instructions},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1987},
  doi = {10.3133/13764},
  url = {https://pubs.usgs.gov/publication/13764},
  note = {Source identifier: 13764}
}