MLA

Hyttinen, Axel, Earl R Schafer, and Forest Products Laboratory (U.S.). Grinding Pretreated Hardwoods : Experiments On Quaking Aspen, Sweetgum, Red Alder, Black Tupelo, Sugar Maple, Red Oak, and Cottonwood. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1955.