@misc{indiciae45721c5daac4,
  title = {Changes in mineral composition of eggshells from black ducks and mallards fed DDE in the diet},
  author = {J. R. Longcore and F. B. Samson and J.F. Kreitzer and J. W. Spann},
  year = {1971},
  doi = {10.1007/bf01540002},
  url = {https://pubs.usgs.gov/publication/5221238},
  note = {Source identifier: 5221238}
}