@misc{indiciae9d9917591b62,
  title = {Avian eggshell thickness: Variability and sampling},
  author = {Erwin E. Klaas and H. M. Ohlendorf and R.G. Heath},
  year = {1974},
  url = {https://pubs.usgs.gov/publication/5221209},
  note = {Source identifier: 5221209}
}