@misc{indiciae98af6808aafe,
  title = {Identifying high production, low production and degraded rangelands in Senegal with normalized difference vegetation index data},
  author = {G. Gray Tappan and Lynette Wood and Donald G. Moore},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70113701},
  note = {Source identifier: 70113701}
}