This is a 231 page historic book published by the Dept. of Public Instruction in the Commonwealth of Pennsylvania during W.W. 2. Is was prepared by the Division of Industrial Education in cooperation with Sun Shipbuilding and Dry Dock Company in June of 1942. It is in a double, spiral binding, and the covers have come loose from the spirals.However, it's all here and in great readable condition. It comes complete with an insert which is a series of blueprints to assist in training. The interior is crisp and clear ! Ideal for Naval Ship Buffs. Please call