When readers borrow books, they will definitely find a label on the spine. There are two groups of numbers on the label, the upper group is the classification number and the lower group is the book number. These two sets of numbers constitute the call number, which is the basis for determining the shelving of a book.
The call number consists of two groups of numbers: the classification number and the book number. The classification number represents the nature of the subject to which the document content belongs, and it can arrange similar books together. The book number represents the distinguishing number of similar documents and determines the arrangement order of similar books.
Library number classification
The call number (classification number and book number) is usually printed on the upper left corner of the catalog card, on the book label under the spine, on the front page or back cover of the book. A call number can only represent one kind of book. Because the shelving methods of library books can basically be divided into two categories: classified shelving and formal shelving. Therefore, call numbers can basically be divided into two categories: classified call numbers and formal call numbers.
Strictly speaking, only the first three parts are part of the classification number, and together with the last two parts form the call number: ".b5" is the book number (generally called the author number), which is used to distinguish different works under the same classification number, and each work has a unique book number. The book number can be derived from the author/editor's name or title, and converted according to the standard table (tool table).