Columbia subject headings:
Migration, Internal--United States.
Northeastern States--Economic conditions.
Regional planning--United States.
Southern States--Economic conditions.
Southwestern States--Economic conditions.
United States--Economic conditions--1945-
Harvard subject headings:
Migration, Internal--United States
Northeastern States--Economic conditions.
Regional planning--United States
Sunbelt States--Economic conditions.
United States--Economic conditions--1945-
Princeton subject headings:
Migration, Internal--United States.
Northeastern States--Economic conditions.
Sunbelt States--Economic conditions.
United States--Economic conditions--1945---Regional disparities.