Columbia subject headings:
Ethnicity--United States.
Social classes--United States.
United States--Race relations.
United States--Social conditions--1933-1945.
United States--Social conditions--1945-
Harvard subject headings:
Ethnicity--United States
Social classes--United States
United States--Race relations
United States--Social conditions--1933-1945.
United States--Social conditions--1945-
Princeton subject headings:
Ethnicity.
Social classes--United States.
United States--Race relations.
United States--Social conditions--1933-1945.
United States--Social conditions--1945-