Trends in birth rates in the United States since 1870.
| Príomhchruthaitheoir: | |
|---|---|
| Formáid: | LEABHAR |
| Teanga: | Béarla |
| Foilsithe / Cruthaithe: |
Baltimore
Johns Hopkins Press
1958.
|
| Sraith: | The Johns Hopkins University studies in historical and political science
ser. 76, no. 1 |
| Ábhair: |