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2521. Naučnaja i obščestvennaja dejatel'nost' Vladimira Andrejeviča Franceva v emigracii v Čechoslovakii /

2522. Naučnaja i prepodavatel'skaja dějatel'nost' Je. V. Spektorskogo v Prage (1924-1928 gg.) /

2530. Naučnyje idei Rudžera Iosipa Boškoviča /