Columbia subject headings:
Political science--United States--History--Dictionaries.
United States--Politics and government--Dictionaries.
Harvard subject headings:
Political science--United States--History--Dictionaries.
Political science--United States--History--Encyclopedias.
United States--Politics and government--Dictionaries.
United States--Politics and government--Encyclopedias.
Princeton subject headings:
Dictionaries.
Political science--United States--History--Dictionaries.
United States--Politics and government--Dictionaries.