Johnstown Flood Museum

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This copy of a photo provided by the Johnstown Flood Museum is one in a collection of photos owned by Rev. David J. Beale made after the 1889 Johnstown flood. As officials prepare to commemorate the 125th anniversary of the enormous Johnstown Flood of 1889 that killed 2,209 people, new research has helped explain why the deluge was so deadly. (AP Photo/Johnstown Flood Museum)