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|  | China Bridge Discover how China's Song dynasty during the eleventh and twelfth centuries used  the high arch "rainbow bridge" to solve the problem of spanning a fast-moving river without impeding boat traffic. Nova online.
 http://www.pbs.org/wgbh/nova/lostempires/china/
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|  | Bridge Signs Douglas Coulter's collection of bridge maker's plates from wrought iron bridges of Illinois. Also features photographs of covered and iron bridges, and bridge postcards.
 http://www.douglascoulter.com/BridgeSigns/
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|  | English versus American Bridges Discussion on the merits of English and American iron bridges. Published in the 1874 edition of the Railway Gazette.
 http://quod.lib.umich.edu/cgi/t/text/pageviewer-idx?c=moa;cc=moa;rgn=full%20text;idno=AJR3197.0001.001;didno=AJR3197.0001.001;view=image;seq=00000001
 Umich.edu  ~  
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