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NOVA - Building the Great Cathedrals

Building the Great Cathedrals Building the Great Cathedrals
How did medieval engineers construct magnificent skyscrapers of glass and stone?
http://video.pbs.org/widget/partnerplayer/1619317222/?player=WGBY-PBS&w=512&h=288&chapterbar=true&autoplay=false How did medieval engineers construct magnificent skyscrapers of glass and stone? /episodes/get/2330 /episode/2330 NOVA: Building the Great Cathedrals /episode-player/2330
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