Mezhvuzovskai︠a︡ Nauchno-prakticheskai︠a︡ Konferent︠s︡ii︠a︡ Denʹ-zemli, Problemy Nauki I Obrazovanii︠a︡ (2nd : 1996? : Biĭsk, Russia?) profile picture

Mezhvuzovskai︠a︡ Nauchno-prakticheskai︠a︡ Konferent︠s︡ii︠a︡ Denʹ-zemli, Problemy Nauki I Obrazovanii︠a︡ (2nd : 1996? : Biĭsk, Russia?)

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День Земли проблемы науки и образования