To make hidden photos reappear, go up to the View menu and place a check mark beside "Hidden Photos". When the hidden photo reappears you will see a red "X" in the upper right corner.
If you want to permanently make a hidden photo visible again, do the above and then CTRL-Click (right click) the photo and select "Unhide Photo."
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How do I hide a series of photos so they do not show in my iPhoto Library?
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