Call Number Guide Line

The call number for an item is like an address for the book on the shelf. Call numbers are located on the spines of library books.

The Library uses the Dewey Decimal Classification (DDC) to organize the books on the shelves.


000 Generalities
100 Philosophy & psychology
200 Religion
300 Social sciences
400 Language
500 Natural sciences & mathematics
600 Technology (Applied sciences)
700 The arts
800 Literature & rhetoric
900 Geography & history

Reading a Dewey Decimal Call Number

305.20973 T39  

300   Social Sciences, Sociology & Anthropology

305  Groups of people

305.2  Age

305.20973   In America (0973 at the end means history and description about America)

T39   Taylor

305.20973 T39   The next America : boomers, millennials, and the looming generational showdown / Paul Taylor.

  • Books are arranged sequentially. The first number of a Dewey Decimal call number indicates the general class the call number falls within. In our example, the book is located under the 300s, which is where books on social sciences are classed. If there is a second or third numbers, these indicates a specific divisons and sections. 305 indicates groups of people.
  • Numbers following the first 3 numbers. The numbers define the subject of the book. The number .2 is referring to a book about a specific age group and 0973 means the history and description about America.
  • The Cutter Number is the next set of numbers. The Cutter Number indicates the author or title of the book. It is taken from a table matching names or titles to a set of numbers. In our example, .T39 reflects the first word of the author, Taylor.