The numerical proportions of the sexes at birth
| Egile nagusia: | |
|---|---|
| Formatua: | Liburua |
| Hizkuntza: | English |
| Argitaratua: |
New York
Kraus
1964.
|
| Saila: | American Anthropological Association. Memoirs
v. 1, pt. 4 |
| Gaiak: |