TY  - RPRT
TI  - Avian eggshell thickness: Variability and sampling
AU  - Erwin E. Klaas
AU  - H. M. Ohlendorf
AU  - R.G. Heath
PY  - 1974
UR  - https://pubs.usgs.gov/publication/5221209
ID  - 5221209
ER  -