@misc{indiciaee015aa4f5166,
  title = {Are soils of Iowa USA currently a carbon sink or source? Simulated changes in SOC stock from 1972 to 2007},
  author = {Shuguang Liu and Z. Tan and Z. Li and S. Zhao and W. Yuan},
  year = {2011},
  doi = {10.1016/j.agee.2010.11.017},
  url = {https://pubs.usgs.gov/publication/70035779},
  note = {Source identifier: 70035779}
}