@misc{indiciae0c8821716703,
  title = {Use of slope, aspect, and elevation maps derived from digital elevation model data in making soil surveys},
  author = {A. A. Klingebiel and E. H. Horvath and D. G. Moore and W.U. Reybold},
  year = {2015},
  doi = {10.2136/sssaspecpub20.c7},
  url = {https://pubs.usgs.gov/publication/70182503},
  note = {Source identifier: 70182503}
}