Columbia subject headings:
Labor supply--United States--Statistics.
Migration, Internal--United States--Forecasting.
United States--Emigration and immigration--Forecasting.
United States--Population--Statistics.
Harvard subject headings:
Labor supply--United States--Statistics.
Migration, Internal--United States--Forecasting.
United States--Emigration and immigration--Forecasting.
United States--Population--Statistics.
Princeton subject headings: