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http://www.pbs.org/wgbh/buildingbig/bridge/index.html
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http://bridgepros.com/
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http://www.jhu.edu/virtlab/bridge/truss.htm
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http://www.howstuffworks.com/bridge.htm
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http://www.faculty.fairfield.edu/jmac/rs/bridges.htm
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http://www.bridgesite.com/funand.htm
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http://www.garrettsbridges.com/
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http://www.lib.washington.edu/specialcoll/exhibits/tnb/
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http://www.wsdot.wa.gov/projects/sr16narrowsbridge/photolibrary/
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http://www.technologystudent.com/struct1/struindex.htm
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http://www.newbaybridge.org/classroom/
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http://pghbridges.com/basics.htm
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http://www.newtonsapple.tv/video.php?id=1286
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http://www.wsdot.wa.gov/projects/sr16narrowsbridge/buildingthebridge/tower.cfm
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http://www.covered-bridges.org/bridges.htm#
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http://pghbridges.com/tours/index.htm