Columbia subject headings:
Assyria--Antiquities.
Bırkleyn (Turkey)--Antiquities.
Caves--Turkey--Bırkleyn--Antiquities.
Tigris River Valley--Antiquities.
Harvard subject headings:
Assyria--Antiquities.
Bırkleyn (Turkey)--Antiquities.
Caves--Turkey--Bırkleyn--Antiquities.
Tigris River Valley--Antiquities.
Princeton subject headings:
Assyria--Antiquities.
Bırkleyn (Turkey)--Antiquities.
Caves--Turkey--Bırkleyn--Antiquities.
Tigris River Valley--Antiquities.