@misc{indiciae3be33db46600,
  title = {Denver liquid sewage sludge: its agricultural benefits and its effect on the metal composition of wheat grown at the Watkins test site, Adams County, Colorado},
  author = {James A. Erdman and Harry A. Tourtelot},
  year = {1976},
  doi = {10.3133/ofr76810},
  url = {https://pubs.usgs.gov/publication/ofr76810},
  note = {Source identifier: ofr76810}
}