Columbia subject headings:
Düzce (Düzce İli, Turkey)--History.
Düzce (Düzce İli, Turkey)--Social life and customs.
Harvard subject headings:
Düzce (Düzce İli, Turkey)--History.
Düzce (Düzce İli, Turkey)--Social life and customs.
Princeton subject headings:
Düzce (Düzce İli, Turkey)--History.
Düzce (Düzce İli, Turkey)--Social life and customs.