@misc{indiciaee6e64f9d9f58,
  title = {Miscellaneous chemical analyses of some rocks, soils, sediments, and plants from North Dakota},
  author = {George Van Trump and R. Vilela Mendes},
  year = {1976},
  doi = {10.3133/ofr7696},
  url = {https://pubs.usgs.gov/publication/ofr7696},
  note = {Source identifier: ofr7696}
}