@misc{indiciae0164a30055c9,
  title = {Availability of elements in soil to native plants, Northern Great Plains},
  author = {R. C. Severson and L. P. Gough and J.M. McNeal},
  year = {1977},
  doi = {10.3133/ofr77847},
  url = {https://pubs.usgs.gov/publication/ofr77847},
  note = {Source identifier: ofr77847}
}