@misc{indiciae74a0cbc0edef,
  title = {Tracking environmental dynamics and agricultural intensification in southern Mali},
  author = {G. Gray Tappan and M. McGahuey},
  year = {2007},
  doi = {10.1016/j.agsy.2005.07.011},
  url = {https://pubs.usgs.gov/publication/70029852},
  note = {Source identifier: 70029852}
}