Columbia subject headings:
Demography.
Population forecasting.
Harvard subject headings:
Demographic transition--Europe.
Demographic transition--North America.
Demography.
Europe--Emigration and immigration.
Fertility, Human--Europe
Fertility, Human--North America.
Mortality--Europe.
Mortality--North America.
North America--Emigration and immigration.
Population forecasting--Europe.
Population forecasting--North America.
Princeton subject headings:
Demography.
Population forecasting.