Columbia subject headings:
United States--Politics and government--1913-1921.
United States--Politics and government--1923-1929.
United States. Congress. Senate.
Harvard subject headings:
United States--Politics and government--1913-1921.
United States--Politics and government--1923-1929.
United States. Congress. Senate.
Princeton subject headings:
United States--Politics and government--1913-1921.
United States--Politics and government--1923-1929.
United States. Congress. Senate