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Library automation means a high degree of mechanization of various routine and repetitive tasks to be performed by library staffs. Presently, public libraries of West Bengal are moving towards automation with koha. Koha, being open source software, allows extensive customization. Most of the libraries are now use their own bibliographic framework for recording different type of documents to save the time of data entry work. This paper highlights the need of customized MARC framework for books in libraries with an instance of use of customized MARC framework in Public libraries of West Bengal.