Sources
Most of the information was taken either from lectures by the great Dr. Newman, or from wikipedia
1. http://dummidumbwit.wordpress.com/2010/06/29/roman-bridges/
2. http://www.vibrationdata.com/Tacoma.htm
3. http://en.wikipedia.org/wiki/Suspension_bridge
4. http://en.wikipedia.org/wiki/Abutment
5. http://en.wikipedia.org/wiki/Cantilever_bridge
6. http://en.wikipedia.org/wiki/Expansion_joint
7. http://www.exponent.com/bridge_girder_failure_during_construction/