Children's Engineering Education: Structures, Forces, Loads, Materials
Trusses Libguide from University of Wisconsin- Carefully read and watch videos.
Trusses Bridge Article from Facts on File
Bridges - Look at the middle of this article for information on Trusses.
Arch Libguide from University of Wisconsin - Please read and watch the videos.
Arches and Vaults
Engineering and Design Libguide from Illawarra Grammar School
How Stuff Works website
Engineering a Bridge