Columbia subject headings:
Industries--United States.
Metropolitan areas--United States.
Migration, Internal--United States.
United States--Social conditions--1960-1980.
Harvard subject headings:
Industries--United States
Metropolitan areas--United States
Migration, Internal--United States
United States--Social conditions--1960-1980.
Princeton subject headings:
Industries--United States.
Metropolitan areas--United States.
Migration, Internal--United States.
United States--Social conditions--1960-1980.