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25 dic 1979 anni - Усилилось внимание к экологическому воспитанию младших школьников. Концептуальные основы этой проблемы разрабатывали И.Д. Зверев, А.Н. Захлебный, И.Т. Суравегина.

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ByАнна Панфилова
15 ott 2017
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25 dic 1979 anni
Adesso
~ 45 years ago
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