@misc{indiciaeea65c6575235,
  title = {Chemical analyses of selected agricultural soils of Missouri},
  author = {Josephine G. Boerngen and Ronald R. Tidball},
  year = {1981},
  doi = {10.3133/ofr81842},
  url = {https://pubs.usgs.gov/publication/ofr81842},
  note = {Source identifier: ofr81842}
}