The article reveals the main principles of formation of the alphabetical subject index (ASI) to the tables of the Library and Bibliographic Classification (LBC). The main functions of the ASI are considered. The significance of the personality of one of the developers of the LBC of Cecilia Moiseevna Berdichevskaya in forming the potential for further development of the national classification system, ensuring its fundamentality, comprehensiveness and integrity at all stages of development is revealed. Directly C.M. Berdichevskaya prepared the original methodology of compiling subject indexes to systematic catalogues of libraries, which was later used in the creation of the ASI to the tables of the LBC. The completion of the publication of the LBC tables for scientific libraries (1960—1968) was an outstanding event in Russian librarianship. The theoretical development of the ASI to the LBC tables was most fully reflected in the “Introduction” to the classification and in articles published in special periodicals.
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