Columbia subject headings:
Harvard subject headings:
Aretin, Karl Otmar, Freiherr von, 1923-2014.
Europe--History--1492-
Germany--History--1517-1871.
Germany--History--1871-
Historiography.
Princeton subject headings:
Aretin, Karl Otmar, Freiherr von, 1923-2014.
Europe--Historiography.
Europe--History.
Germany--History.