Columbia subject headings:
Germans--Europe--History--19th century.
Germans--Europe--History--20th century.
Germany--History--1789-1900--Congresses.
Germany--History--20th century--Congresses.
Harvard subject headings:
Germans--Europe--History--19th century.
Germans--Europe--History--20th century.
Germany--History--1789-1900--Congresses.
Germany--History--20th century--Congresses.
Princeton subject headings:
Germans--Europe--History--19th century.
Germans--Europe--History--20th century.
Germany--History--1789-1900--Congresses.
Germany--History--20th century--Congresses.