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29 dic 1971 anni - Письмо Министерства № 473 – М «О преподавании природоведения в школах РСФСР» большое положительное влияние природоведения на образовательную и воспитательную работу с учащимися.

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ByАнна Панфилова
15 ott 2017
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29 dic 1971 anni
Adesso
~ 53 years ago
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