Columbia subject headings:
Europe, Eastern--Historiography.
Hoetzsch, Otto, 1876-1946.
Harvard subject headings:
Europe, Eastern--Historiography.
Hoetzsch, Otto, 1876-1946.
Princeton subject headings:
Europe, Eastern--Politics and government.
Germany--Politics and government.
Historians--Germany--Biography.
Hoetzsch, Otto, 1876-1946.