Examines the engineering that enabled the creation of large structures. 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 : 7-NOV-2006 RETURNS ACCEPTED? : YES RUNTIME : 200
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