Columbia subject headings:
Harvard subject headings:
Baethgen, Friedrich, 1890-1972
Historiography--Germany--History--20th century
Medievalists--Germany--Biography.
Middle Ages--Historiography
Princeton subject headings:
Baethgen, Friedrich, 1890-1972.
Historiography--Germany--History--20th century.
Medievalists--Germany--Biography.
Middle Ages--Historiography.