Sony Reader PRS-950 - Manual (Page 106)

Collections
106
Table of Contents Index
Removing content
Even if you delete content in a collection, the
remaining content will be left on the Reader.
1
Tap [Collections] at [Home] menu  tap a
collection.
2
Press OPTIONS  tap [Remove Content].
3
Tap the thumbnail of each content to be
deleted  [Done]  [Yes].
Tips
 To select all content, press OPTIONS after step 2 above 
tap [Select All].
 When you delete content in [Books] or [Periodicals],
corresponding content is also deleted from relevant
collections.