Skip to main content

The Dewey Decimal System: Home

The Basics

The Dewey Decimal System organizes information into ten broad areas, which are broken into smaller topics. Different topics are assigned numbers known as "call numbers." For example, baking is given the number 641.8. To see what books the library has on baking, find the books that have that number on their spine label.

At the Sullivan Main Library (Louisville), 000-639 are in the East Wing and 640-999 are in the West Wing.

Dewey Decimal System subjects with call numbers

The most frequent requests from Sullivan students include:

  • Computers/Software: 004 - 006
  • Encyclopedias: 030 - 039
  • Psychology: 150 - 159
  • Ethics: 170 - 179
  • Economics: 330 - 339
  • Law: 340 - 349
  • Criminology: 364
  • Education: 370 - 379
  • Dictionaries: 413
  • Food and Drink: 641
  • Accounting: 657
  • Management: 658
  • Speeches: 815
  • Biographies: 920 - 929