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The article features the scheme of library classification applied to standard catalogs and printed cards for public libraries in Moscow, U.S.S.R. Two important facts about the classification scheme are excluded from the title page such as the version of the Dewey Decimal Classification and that the scheme is in a direct line of succession to the L. N. Tropovskii abridgment of Dewey. In spite that it is widely used for the Marx-Engels-Lenin-Stalin literature to the Soviet Union, it is still a fact that the scheme is based on Dewey which was also admitted by Tropovskii in his introduction. The two important changes in Tropovskii's short schedule are the use of special devices for giving primacy to the classics of communism and books on the USSR and people's republics.