Theories, principles, and practices of bibliographic description, application of international standards such as Anglo-American cataloging Rules (AACR2), the International Standard Bibliographic Description (ISBD), and machine-Readable Cataloging (MARC21) to the creation of bibliographic records and to the construction of catalogs in libraries and other information environments, the structure of MARC 21 formats and records, construction of bibliographic records for materials of different formats using the MARC 21 format, automated systems, on line catalogs, copy cataloging.