@misc{indiciae6cabce516dfd,
  title = {A comparison of methods for estimating extractable amounts of 17 constituents in samples of mine soil from coal strip mines in the Western Energy Region},
  author = {R. C. Severson and M. L. Tuttle and J. L. Peard and J.G. Crock},
  year = {1981},
  doi = {10.3133/ofr81180},
  url = {https://pubs.usgs.gov/publication/ofr81180},
  note = {Source identifier: ofr81180}
}