A library is a part and parcel of education. It is a store-house of knowledge to the knowledge hungers. There are thousands of different books on different branches of knowledge in a library. It is not possible to find our any particular book from among them without making certain sorts of arrangements of them. This is way these books are needed to be arranged in a systematic way to locate any particular book quite easily. All of the books in a library are organized into categories or classes and then arranged alphabetically within their class. There are two systems for organizing the books in a library. One is called the Dewey decimal system. Most of the libraries follow the Dewey decimal system. Under the Dewey decimal system, the books are a grouped into ten major categories of subject areas. Each category is assigned its own special number within that number range. For example, scienceis assigned numbers from 500 to 599. A particular science book would never have a number such as 800 or 200. The number that is assigned to a book is called call number.
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