Columbia subject headings:
Ethnicity--Congresses.
History, Modern--20th century--Congresses.
Political psychology--History--Congresses.
Harvard subject headings:
Ethnicity--Congresses
History, Modern--20th century--Congresses.
Political psychology--History--Congresses.
Princeton subject headings:
Historiography.
History, Modern--20th century.
Political science--History--20th century.