Columbia subject headings:
United States--Politics and government--1901-1909.
United States--Politics and government--1909-1913.
United States--Politics and government--1913-1921.
Harvard subject headings:
United States--Politics and government--1901-1909.
United States--Politics and government--1909-1913.
United States--Politics and government--1913-1921.
Princeton subject headings:
United States--Politics and government--1901-1909.
United States--Politics and government--1909-1913.
United States--Politics and government--1913-1920.