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29 dic 1971 año - 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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453

fecha:

29 dic 1971 año
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~ 52 years ago
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