In this Monday, May 12, 2014 photo, Fadi Khalil, an employee in the photo archive of the United Nations Relief and Works Agency (UNRWA), organizes color slides to be digitized at the UNRWA archive library in Gaza City, in the northern Gaza Strip. UNWRA's vast photo archive is being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/Adel Hana)
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