@misc{indiciaeced4189ee409,
  title = {A survey of Pb, Cu, Zn, Cd, Cr, As, and Se in earthworms and soil from diverse sites},
  author = {W. N. Beyer and E.J. Cromartie},
  year = {1987},
  doi = {10.1007/bf00396605},
  url = {https://pubs.usgs.gov/publication/5222217},
  note = {Source identifier: 5222217}
}