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15 h 47 m, 21 jan 1931 ano - Установлены основные типы научных учреждений: отраслевые институты при вузе, низовые учреждения (заводские лаборатории, опытные станции), региональные институты

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ByЮлия Отева
26 dez 2017
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0
687

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15 h 47 m, 21 jan 1931 ano
Agora
~ 94 years ago
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