Columbia subject headings:
Harvard subject headings:
Austria--Foreign relations--Turkey--Congresses.
Turkey--Foreign relations--Austria--Congresses.
Turkey--History--Ottoman Empire, 1288-1918--Congresses.
Princeton subject headings:
Austria--Foreign relations--Turkey--Congresses.
Turkey--Foreign relations--Austria--Congresses.
Turkey--History--Ottoman Empire, 1288-1918--Congresses.