@misc{indiciae2d02e65daf3e,
  title = {Digital raster graphics},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/fs07099},
  url = {https://pubs.usgs.gov/publication/fs07099},
  note = {Source identifier: fs07099}
}