O. K. Dreĭer

• Ecological problems of developing countries
• Ėkologicheskie problemy razvivai︠u︡shchikhsi︠a︡ stran
• Ekologicheskie problemy razvivai︠u︡shchikhsi︠a︡ stran
• Istorii︠a︡ Afriki v drevnikh i srednevekovykh istochnikakh
• O kollegakh i tovarishchakh
• Razvivai︠u︡shchiesi︠a︡ strany i globalʹnye problemy
• Slovo ob uchiteli︠a︡kh