Columbia subject headings:
Harvard subject headings:
Holy Roman Empire--History--1648-1804--Congresses.
Holy Roman Empire. Reichstag--History--Congresses.
Legislative bodies--Holy Roman Empire--Congresses.
Regensburg (Germany)--History--Congresses.
Princeton subject headings:
Holy Roman Empire--Politics and government--Congresses.
Legislative bodies--Holy Roman Empire--Congresses.
Regensburg (Germany)--History--Congresses.