@misc{indiciae077f397b71fe,
  title = {Marked DDE impairment of mallard reproduction in controlled studies},
  author = {R.G. Heath and J. W. Spann and J.F. Kreitzer},
  year = {1969},
  doi = {10.1038/224047a0},
  url = {https://pubs.usgs.gov/publication/5221264},
  note = {Source identifier: 5221264}
}