Columbia subject headings:
Koç, Ömer M. (Mehmed), 1962---Collections.
Turkey--Civilization--Sources.
Turkey--History--Ottoman Empire, 1288-1918--Sources.
Turkish letters.
Harvard subject headings:
Koç, Ömer M. (Mehmed), 1962---Collections.
Turkey--Civilization--Sources.
Turkey--History--Ottoman Empire, 1288-1918--Sources.
Turkish letters.
Princeton subject headings:
Turkey--Civilization--Sources.
Turkey--History--Ottoman Empire, 1288-1918--Sources.
Turkish letters.