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dec 29, 1971 - 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 Oct 2017
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dec 29, 1971
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~ 54 years ago
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