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1. 1001 задача для умственного счета [electronic resource] / Sergei Aleksandrovich Rachinskii

by Rachinskii, Sergei Aleksandrovich, 1836-1902.

Publisher: Project Gutenberg, 2005Online access: Click here to access online Availability: Items available for loan: Project Gutenburg (1).
2. 1001 задача для умственного счета [electronic resource] / Sergei Aleksandrovich Rachinskii

by Rachinskii, Sergei Aleksandrovich, 1836-1902.

Publisher: Project Gutenberg, 2005Online access: Click here to access online Availability: Items available for loan: Project Gutenburg (1).