@misc{indiciae708206294417,
  title = {δ 13 C values of soil organic matter in semiarid grassland with mesquite ( Prosopis ) encroachment in southeastern Arizona},
  author = {Thomas H. Biggs and Jay Quade and Robert H. Webb},
  year = {2002},
  doi = {10.1016/s0016-7061(02)00227-6},
  url = {https://pubs.usgs.gov/publication/70024097},
  note = {Source identifier: 70024097}
}