If you are in the process - beginning, middle or end - of automating your catalogue, you will welcome the wealth of information provided in this user-friendly manual. Byrne has produced a concise handbook for libarians new to MARC and for those accustomed to using MARC data. All three types of MARC records are explained, along with considerations and specifications for MARC database processing, MARC products and online systems. The second edition of this book includes a new chapter on MARC format integration and updates all information, including that on MARC authority records and holdings records. The author also explains new and changed MARC codes that resulted from MARC format integration.