How to Delete iBooks From a Purchased List

Launch iTunes and select the 'iTunes Store' button in the menu bar. If you enabled the option to show the sidebar located under the View menu, select the 'iTunes Store' link in the sidebar.
Click the 'Books' tab.
Select the 'Purchased' link in the Books Quick Links sidebar.
Hover over the book you want to delete and click the 'X' to hide the book from your purchased list.
Click the 'Hide' button to confirm that you want to hide the book.
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