Yes, decirculated library books may be swapped at PBS.

• Ex-library books often have stamps inside or on the binding: this is fine.  

If you receive an ex-library book that is not clearly marked "withdrawn" (not all libraries do this), you should first contact the sender, to ask about the book; you can also contact the library to ask them if this book is still part of their collection.

• If the book is still part of the library's active collection, you should contact us.

If you do not wish to receive ex-library books, you should put this into your Requestor Conditions in your Account Settings.

Related Links:

What can be posted for swapping here?
How to Use Requestor Conditions