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As far as i can tell there are 27 different types of truss bridges (i.e. Brown truss, Bowstring truss, Kingpost truss, Long truss, and Pratt truss). Hope this helps :D
Holmes on Homes - 2001 Lack of Truss was released on:
USA: 1 February 2007
the truss
trussesWarren truss bridge
a truss