Columbia subject headings:
Harvard subject headings:
Austria--History--1273-1519--Congresses.
Austria--History--16th century--Congresses.
Austria--Kings and rulers--Congresses.
Europe--Kings and rulers--Congresses.
Habsburg, House of--Congresses.
Habsburg, House of--History--Congresses.
Imperialism--History
Princeton subject headings:
Austria--History--1273-1519--Congresses.
Austria--History--16th century--Congresses.
Habsburg, House of--History--Congresses.
Imperialism--History.