Columbia subject headings:
Austria--History--1914-1938--Sources.
Danube River Valley--History--Sources.
Revolutions--Danube River Valley--History--20th century--Sources.
World War, 1914-1918--Austria--Sources.
Harvard subject headings:
Austria--History--1918-1938--Sources.
Danube River Valley--History--Sources.
Revolutions--Danube River Valley--History--20th century--Sources.
World War, 1914-1918--Austria--Sources.
Princeton subject headings:
Austria--History--1867-1918--Sources.
Austria--History--1918-1938--Sources.