Columbia subject headings:
Politics and war--United States--History--20th century.
United States--Politics and government--1969-1974.
Vietnam War, 1961-1975--Causes.
Vietnam War, 1961-1975--Diplomatic history.
Vietnam--Politics and government--1945-1975.
Harvard subject headings:
Princeton subject headings:
Politics and war--United States--History--20th century.
United States--Politics and government--1969-1974.
Vietnam War, 1961-1975--Causes.
Vietnam War, 1961-1975--Diplomatic history.
Vietnam--Politics and government--1945-1975.