@misc{indiciaecf01e7616ec3,
  title = {Eggshell breakage by incubating black ducks fed DDE},
  author = {J. R. Longcore and F. B. Samson},
  year = {1973},
  doi = {10.2307/3800130},
  url = {https://pubs.usgs.gov/publication/5221224},
  note = {Source identifier: 5221224}
}