@misc{indiciae426021eb2466,
  title = {Organochlorine pesticides and polychlorinated biphenyls in black duck eggs from the United States and Canada--1971},
  author = {J. R. Longcore and B.M. Mulhern},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/5221234},
  note = {Source identifier: 5221234}
}