Columbia subject headings:
Hintze, Hedwig, 1884-1942--Correspondence.
Hintze, Otto, 1861-1940--Correspondence.
Historians--Germany--Correspondence.
Harvard subject headings:
Princeton subject headings:
Hintze, Hedwig, 1884-1942. Correspondence.
Hintze, Otto, 1861-1940. Correspondence.
Historians--Germany--Correspondence.