@misc{indiciae4e5ddf12cd23,
  title = {Analysis of soil samples from the San Joaquin Valley of California},
  author = {S. A. Wilson and K. R. Kennedy and C. A. Gent and Paul H. Briggs and R.R. Tidball and J.M. McNeal},
  year = {1990},
  doi = {10.3133/ofr90214},
  url = {https://pubs.usgs.gov/publication/ofr90214},
  note = {Source identifier: ofr90214}
}