Pages and sections that you delete in OneNote 2013 go to the Recycle Bin, where they remain for 60 days or until you delete them on your own. As long as 60 days have not passed since you deleted a page or section, you can restore it.
In the Recycle Bin, deleted pages are stored on the Deleted Pages tab. The names of deleted sections appear as section tabs. To restore a page or section from the Recycle Bin, move the page or section back to your notebook by using the Move or Copy command.
On the ribbon, click the History tab.
Click the Notebook Recycle Bin button
The Recycle Bin appears.
Click the Deleted Pages tab.
Right-click a page name on the page ...