Columbia subject headings:
Population forecasting--United States.
United States--Emigration and immigration--Statistics.
United States--Population--Statistics.
Harvard subject headings:
Population forecasting--United States.
United States--Emigration and immigration--Statistics.
United States--Population--Statistics.
Princeton subject headings:
Population forecasting--United States.
Statistics.
United States--Emigration and immigration--Statistics.
United States--Population--Statistics.