@misc{indiciaebc37a75d119b,
  title = {Dieldrin and eggshell thickness in ducks},
  author = {P.N. Lehner and A. Egbert},
  year = {1969},
  doi = {10.1038/2241218a0},
  url = {https://pubs.usgs.gov/publication/5221262},
  note = {Source identifier: 5221262}
}