@misc{indiciae6c989d42bbe6,
  title = {Miscellaneous Chemical Analyses of Some Rocks, Minerals, Soils, Sediments, and Plants from South Dakota},
  author = {George Van Trump and R.V. Mendes},
  year = {1976},
  doi = {10.3133/ofr7697},
  url = {https://pubs.usgs.gov/publication/ofr7697},
  note = {Source identifier: ofr7697}
}