Columbia subject headings:
Political parties--Law and legislation--Europe--Congresses.
Political parties--Law and legislation--Germany--Congresses.
Harvard subject headings:
Political parties--Law and legislation--Germany--Congresses.
Princeton subject headings:
Comparative government--Congresses.
Germany--Politics and government--20th century--Congresses.
Political parties--Law and legislation--Congresses.
Political parties--Law and legislation--Germany--Congresses.
Political science--Congresses.