Salem retiree Evelyn Potts, visiting the "Spruce Goose" at the Evergreen Aviation Museum, shook her head in irritation at the name the famous airplane is known by. "It was birch, not spruce," Potts said, looking the plane over. "It really is birch." She should know. She ordered the wood the plane is made from, as well as the glue that holds it together. Potts played an important role in the construction of the Spruce Goose, the enormous wooden aircraft built by millionaire aviator Howard Hughes during World War II.