@misc{indiciae3e7f8fee4fa4,
  title = {Spatial variation in total element concentration in soil within the Northern Great Plains coal region and Regional soil chemistry in Bighorn and Wind River basins, Wyoming and Montana},
  author = {R. C. Severson and R.R. Tidball},
  year = {1979},
  doi = {10.3133/pp1134ab},
  url = {https://pubs.usgs.gov/publication/pp1134AB},
  note = {Source identifier: pp1134AB}
}