Columbia subject headings:
Census data.
Demographic surveys--Turkey--Düzce İli.
Düzce İli (Turkey)--Census, 1831.
Düzce İli (Turkey)--Population--History--19th century--Statistics.
Manuscripts, Turkish--Turkey--Istanbul--Facsimiles.
Turkey--Census, 1831.
Harvard subject headings:
Princeton subject headings:
Demographic surveys--Turkey--Düzce (Bolu İli).
Düzce İli (Turkey)--Population--19th century--Statistics.
Statistics.