This paper concentrates on contents of LBC in the Soviet period. It was analyzed the general methods of common auxiliaries in this library classification. This paper has demonstrated the specificities of historical realities reflected in the Contemporary history of LBC during the systematization of information. Comparisons are made of methodological decisions used in the timeline display processes in the USSR and in other countries. It was observed effects manifestations of ideological influence on the content of the Soviet LBC.
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