@misc{indiciaeb8896be6464d,
  title = {Hand signs for technical terms used in thematic and topographic mapping},
  author = {Richard W. Will and William B. Krohn},
  year = {1989},
  doi = {10.3133/cir1014},
  url = {https://pubs.usgs.gov/publication/cir1014},
  note = {Source identifier: cir1014}
}