Sony Reader PRS-T2 User Manual page 144

Note
 If you have deleted an item from [Books], it will be
automatically removed from all of the collections with
which it was associated.
 Removing items from a collection does not delete them
from the Reader or their stored locations.
 If you remove an item from a collection that does not exist
in other collections, its original will be moved back to the
[Default Collection] in the Reader. If you remove an item
that exists in another collection(s), it will remain in the
other collection(s), and not be moved back to the [Default
Collection].
Tip
 You can remove all items at once. After completing Step 1
above, press the
Table of Contents
(Menu) button
Using Collections

[Select All].
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