@misc{indiciaeaa68ff4c35d8,
  title = {Thickness of 1967-69 whooping crane eggshells compared to that of pre-1910 specimens},
  author = {Daniel W. Anderson and J.F. Kreitzer},
  year = {1971},
  doi = {10.2307/4083896},
  url = {https://pubs.usgs.gov/publication/5221755},
  note = {Source identifier: 5221755}
}