APA

Products Laboratory (U.S.), F., Lewis, 1., Heebink, 1., Cottingham, W., & Dawley, E. (1960). Supplement to design of plywood webs in box beams : additional tests of box beams and I-beams to substantiate further the design curves for plywood webs in box beams -- tests of plywood webs in the tension field. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory.