APA

Lewis, 1., Heebink, 1., Cottingham, W., & Products Laboratory (U.S.), F. (1965). Supplement to design of plywood webs in box beams : buckling and ultimate strengths of shear webs of box beams having plywood face grain direction parallel or perpendicular to the axis of the beams. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory.