**Define Call Number, Class Number, Book Number & Collection Number in Library Classification Scheme?**

**What is Call Number**

Thus, if you know the general sequence of arrangement of books in a library, the call number of a book will guide you to the area and to the exact place where the book is kept.

**Call Number
= Class Number + Book Number + Collection Number**

**The Call
Number has three parts: **

**(a) Class
Number**

**(b) Book
number**

**(c)
Collection number**

**What is Class Number**

Class number of a book represents its subject. As you know, a classification scheme organizes all the subjects in a systematic order and uses an artificial scheme of numbers, alphabets, and symbols called notation, for each subject.

The notation used for a particular subject in a classification scheme is called it's class number.

**Examples:**
The class number of Library Science is 2 and the class number of Mathematics is
B. All the classification schemes use notation to represent different subjects.

Thus, the
class number of **Library Science in CC is 2 whereas in DDC it is 020. Similarly,
the class number of Mathematics in CC and DDC is B and 510** respectively.

**Define Book**** Number**

You have
understood the class number which is assigned to different books on the basis of
their subject. **Books of different subjects will have different class numbers.**

We need some
method to distinguish all the books having the same class number so that these
books can be arranged in some order and finds their unique place on the shelf.
Books of the same class can be arranged according to **book number.**

**According to
Dr. S R Ranganathan “,** the book number of a book is a symbol used to fix its
position relative to the other books having the same ultimate class”. So,
different books on the same subject will have the same class number but
different book numbers.

**Methods of
assigning book numbers**

**Author’s
surname method:** It is the most simple method of assigning book numbers. In this
method, we use the first three digits of the author’s surname as the book
number. In case the author’s surname is not letters given, the book number can
be constructed from the forename.

**Example: **

**Author’s
name Book number**

**SR
Ranganathan RAN**

**Prof
Kasyap KAS**

DDC: Based on the name of the author under which the first three letters of the name are included.

Example: Ranganathan RAN

Based on the
author's Date of Birth

Example: J64

Based on the
year of publication of the book

Example: N33 (1933)

**Book Number formula by SR Ranganathan: ****Colon Book
Number System**

Dr. SR
Ranganathan has given an elaborate scheme of book number consisting of

following fields:

**Formula of
book number: [L][F][Y][A].[V]-[S];[C]:[Cr] **

Where

L = Language
of the book

F = Form in
which the book is written e.g. index, list, picture, graph.

Y = Year of
publication of the book

A =
Accession part of the book number. It is given when more than one books of the same subject published in the same year are acquired in the library

V = Volume the number is given when a multivolume book is acquired in the library

S =
Supplement number is given when a supplement is published for a volume

C = Copy
number particularly useful for school and college libraries where multiple
copies of textbooks are acquired

Cr = Criticism number is used when a book based on some other book is acquired in the library.

**Define Collection
Number**

The collection number, if used, indicates a major grouping within a library or library system.

Libraries generally do not have a single sequence of books. Reference books are separated from other books in most libraries. In school and college libraries textbooks are kept separately.

In
university libraries, there may be separate departmental libraries besides
separate **reference collection. **

Thus, a book maybe in any of the collections in the library and it is necessary to mention the collection where that book is.

The indication of the collection is made by some symbols called collection numbers. Although, a library may devise its own collection number scheme which may help in indicating the collection.

**Reading
Room RR**

**Periodicals
Collection PC**

**Library
Science Department 2D**

**Physics
Department CD**

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