MLA Citation Style
Here's another one Parenthetical Documentation. Scroll down until you see Using a parenthetical citation.
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Darfur Links
Banking on the Future
Bridges
pbs.org has examples of different types of bridges and explanations of them.
Bridge Research has information on bridges that have collapsed and the cost of maintaining the nation's bridge.
How stuff works gives more information on bridges.
pghbridges.com has great diagrams of different types of bridges and trusses.
Use the Forces Lab to understand how different shapes, materials, and directional forces effect your structure.
The Bridge Challenge tests your skill at choosing the right bridge and the right materials.
