Columbia subject headings:
Harvard subject headings:
Courts and courtiers--History--Congresses.
Gay rights--History--Congresses.
Gays--Legal status, laws, etc.--Congresses.
Homosexuality--History--Congresses.
Sex and law--History--Congresses.
Princeton subject headings:
Gays--Legal status, laws, etc.--Europe--History.
Homosexuality--Germany--History.
Homosexuality--Law and legislation--Germany.
Male homosexuality--Political aspects--Germany--History--20th century.