Seçkin, Nurettin Cografya : Türkiye: Orta: III / Nurettin Seçkin. - Istanbul : Inkilap ve Aka, 1973. - 176 p. : ill.:maps ; 24 cm. - Ortaokul kitaplari . - 91 (56) (NLA) . Subjects--Geographic Terms: Turkey--Geography.Turkey--Regional geography Universal Decimal Class. No.: 91 (56) (NLA)