@misc{indiciae61221edaa28d,
  title = {Preferred method for removing surface contaminants from geobotanical samples before metals analysis},
  author = {C. M. Ager and N.M. Milton and M.S. Power},
  year = {1985},
  doi = {10.3133/ofr85379},
  url = {https://pubs.usgs.gov/publication/ofr85379},
  note = {Source identifier: ofr85379}
}