Haitian Pres Rene Preval calls toll from earthquake 'unimaginable,' as survivors strain against chunks of concrete that bury Port-au-Prince along with thousands of its residents; schools, hospitals and prisons have collapsed; 16 United Nations peacekeepers are known to be dead and more than 140 UN workers are missing, including mission chief Hedi Annabi; many of poor that define nation are hurt, bloody and without food or water; limbs protrude from concrete and muffled cries emanate from deep w...

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