Explores four lesser known members of the dinosaur family; Mamenchisaurus, Chasmosaurus, Spinosaurus, Parasaurolophus. ARTIST : ARTIST NOT PROVIDED BRAND : GAIAM, INC. GENRE : TELEVISION: NATIONAL GEOGRAPHI MANUFACTURER : NATIONAL GEOGRAPHIC/VISUAL ENT PRODUCT TYPE : DVD PRODUCT TYPE : DVD RATING : NR RATING : NR RELEASE DATE : 9-FEB-2010 RETURNS ACCEPTED? : YES RUNTIME : 50
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