The Dewey Directory
The Dewey Directory is on 3 sides of a column in the middle of the DRE library.  Ms. Suby uses it to teach the Dewey Hundreds groups, and students use it to find their subject quickly when the computers are busy.
 

If you would like a copy to use in your own library, click on the picture of Melvil Dewey.  You must have Microsoft Word to open the document.