Synopsis The main function of the libraries is to help the students, the researchers and other readers. The library science teachers have over a period of time learnt some lessons in the methods of cataloguing the books. A good library keeps a good catalogue of books which is both according to author-wise and according to title-wise. In this process the Dewey decimal system of cataloguing has been found to be very useful and up-to-date. This book is meant for the students who have opted library science as their subject of graduation. It is also useful for those librarians who do not receive formal and regular training in library science.