APA

Englerth, 1., Hansbrough, 1., States. Division of Forest Pathology, U., & Products Laboratory (U.S.), F. (1945). The significance of the discolorations in aircraft lumber : noble fir and western hemlock. : Madison, Wis. : United States Dept. of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forest Pathology, in cooperation with the Forest Products Laboratory, Forest Service.