| 2, at ; "Radiometric data suggest that the whole Southern Mesopotamian Ubaid period, including Ubaid 0 and 5, is of immense duration, spanning nearly three millennia from about 6500 to 3800 B | |
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| Constitution of Iraq, Article 4 5th• The Guardian, 21 August 2005 | Bulletin of the Atomic Scientists |
"Public Museum" Around 530 B.
6| Washington Report on Middle East Affairs | Times History of the World |
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| 20 Princess Ennigaldi-Nanna, collected antiques from the southern regions of Mesopotamia, which she stored in a temple at Ur — the first known museum in the world | The Organisation for the Prohibition of Chemical Weapo• , William Morrow and Company, 1993 |
The 1982 World Book Year Book.