LibGuides: Research Sources and How To Use Them: Library Arrangement (Dewey Decimal Classes)

Dewey Decimal Classes

Dewey Decimal Classes - from OCLC
A pdf of the entire Dewey Decimal Classification system.

Shows the hundreds classes (broadest)
The tens and the ones (narrower and narrower cataloging).
Wikipedia.org - Dewey Decimal Classification system
The expandable list of all Dewey Decimal Classes. Scroll and click.

Where are the psychology books?
What is 225?