Columbia subject headings:
Population forecasting--United States.
Population--Environmental aspects--United States.
United States--Emigration and immigration--Government policy.
United States--Emigration and immigration--Social aspects.
Harvard subject headings:
Population forecasting--United States.
United States--Emigration and immigration--Government policy.
United States--Emigration and immigration--Social aspects.
United States--Population--Environmental aspects.
Princeton subject headings:
Population forecasting--United States.
Population--Environmental aspects--United States.
United States--Emigration and immigration--Government policy.
United States--Emigration and immigration--Social aspects.