The process of evaluating the outputs of library catalogs is one of the important methods that help improve the services provided by those libraries in general and the catalog services in particular, in order to carry out modifications and development processes in line with the aspirations of those libraries and the needs of their beneficiaries. The quality of catalogs is measured by the quality of their records. Therefore, the study seeks to identify the reality of the bibliographic records available on the direct catalog of the Central Library at the University of Mosul and the extent of their commitment to the known international standards and rules for indexing. An irregular, random sample of Arabic book records consisting of (609) bibliographic records was selected for the purpose Analysis and conformity with the Anglo-American Cataloging Rules (AACR2) in force in the library, with reference to the title pages of its sources. The study came out with several results, the most important of which was that the percentage of compliance with the Anglo-American Cataloging Rules for all fields of the studied sample records for the central librarys direct catalog reached (47.8%), while more than half of the sample did not adhere to the rules, and its percentage reached (52.2%). This percentage requires reconsideration of the records prepared by the Central Library and made available in its direct catalogue. Also, the field that most adheres to the rules in the bibliographic records of the sample is the field (100 main entries). With a percentage of (88.8%), the field that adheres least to the rules in the bibliographic records of the sample is the field (500 notes) with a percentage of (12.3%). The study also recommended the necessity of adhering to the application of Anglo-American cataloging rules to all fields of bibliographic records in the central library catalogue. At the University of Mosul, reviewing the completed records and amending their fields according to what is appropriate, as well as emphasizing the necessity of adopting modern developments in indexing rules, represented by the rules for describing sources, making them available by RDA, and training those working on them to work according to them in index records in the near future.