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NOVA scienceNOW: Mass Extinction
NOVA scienceNOW: Mass Extinction
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NOVA scienceNOW: Mass Extinction
What caused the mother of all extinctions 250 million years ago?
Channel: PBS
Category: Science
Video Length: 795
Date Found: October 09, 2007
Date Produced: November 21, 2006
View Count: 188
 
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