Dmitry Sova, ICLIS SPbSTU Union catalogue and creation of a consolidated record in the RUSMARC format Both experience of SPbSPU library automation of and experience of the consortium development showed that the question of bibliographic record deduplication has become of crucial importance. The problems appeared during the card catalogues retroconversion as well as union catalogues development raised the complexity of deduplication process. How to realize the mechanism of consolidated record creation? How to evaluate its reliability and effectiveness? What are specific features for the RUSMARC records?