Columbia subject headings:
Harvard subject headings:
Gebze (Turkey)
Gebze (Turkey)--Economic conditions.
Gebze (Turkey)--History.
Gebze (Turkey)--Politics and government.
Gebze (Turkey)--Social conditions.
Kocaeli İli (Turkey)--History.
Princeton subject headings:
Gebze (Turkey)--History.
Kocaeli İli (Turkey)--History.