Columbia subject headings:
United States--Civilization--1945---Encyclopedias.
United States--Economic conditions--1945---Encyclopedias.
United States--Politics and government--20th century--Encyclopedias.
United States--Social conditions--1945---Encyclopedias.
Harvard subject headings:
United States--Civilization--1945---Encyclopedias.
United States--Economic conditions--1945---Encyclopedias.
United States--Politics and government--20th century--Encyclopedias.
United States--Social conditions--1945---Encyclopedias.
Princeton subject headings:
Encyclopedias.
United States--Civilization--1945---Encyclopedias.
United States--Economic conditions--1945---Encyclopedias.
United States--Politics and government--20th century--Encyclopedias.
United States--Social conditions--1945---Encyclopedias.