Sommario
Documenti e problemi di ricerca
| Historical sex ratio in fetal mortality in the United States and its impact on the sex ratio at birth | |
| Jesus J. Sánchez Barricarte | 9-35 |
| Historical sex ratio in fetal mortality in the United States and its impact on the sex ratio at birth | |
| Jesus J. Sánchez Barricarte | 9-35 |