The Elements of Boat Strength for Builders, Designers, and Owners By Dave Gerr
This is one of the best reads that I have found for boat building or restoring. It was recommended by a member up here and I went out and ordered it. The book has plenty of how to instruction, scantling rules/figures, diagrams, and descriptions/definitions. It is a must have for anyone doing a restore, building a boat or doing repairs.
http://www.amazon.com/The-Elements-B.../dp/0070231591