@misc{indiciaef909c3330c5c,
  title = {Analytical results of soil sampling by two field methods; a comparison},
  author = {R. C. Severson and F. Paveglio and D. B. Hatfield and Paul H. Briggs},
  year = {1987},
  doi = {10.3133/ofr87354},
  url = {https://pubs.usgs.gov/publication/ofr87354},
  note = {Source identifier: ofr87354}
}