Научно-технический прогресс в народном хозяйстве Эстонской ССР в 1966-1970 годах : (краткая статистическая справка) : в помощь лектору (Eesti NSV ühing "Teadus" ; 21)
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URL: http://www.digar.ee/id/nlib-digar:974845
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URL: http://www.digar.ee/id/nlib-digar:974845
