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The standard laminated handle material used is basically a resin impregnted Birch plywood. Sometimes called Dymondwood.
I'm not positive but I suspect Rutland Plywood is the source. Of course Buck also uses exotic woods on some knives.
DymondWood® is distinguished by its unique strength, durability, dimensional stability, and weather and moisture resistance as compared to regular wood.
http://www.rutply.com/products/dymondwood.html