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book from all others having the same class. It usu—— ally consists of an Author Number, a work mark,. and volume or copy number. {t is composed of letters and figures. It serves not only to identify a particular book among others having the same class number but also to place those books in the desired order on the sheives according to author, title, edition, ete. When the book number is used to arrange the books alphabetically according to: Authors it is called “Author Number’’. In Colon: Classification the book number is the translation cf the names of certain features of a book into the artificial language or ordinal numbers. It is made up of one or more of the following symbols : —

24 Roman capital letters omitting [ and QO, 25: small Roman letters omitting i and o, the punctua- tion marks, hyphen, semi-colon, dot and colon and the 10 Arabic numerals. It consists of one or more: of the following successive numbers : —language number, form number, year, accession part of book. number, volume number, supplement number, copy number, criticism number and accession part of eriticism number.

CALL NUMBER

The two conjoined—class number and book. number—zsive the call number. In Colon Classifica- tion it consists of class number, book number and: -eollection number. Since we use the call number in calling for a book, it is called so. Itisa symbol. made up of either letters or figures or both. §.

PURPOSE OF LIBRARY CLASSIFICATION

The library classification is a systematic scheme for the arrangement of documents according to specific subjects dealt with in the documents, Im