MLA

Products Laboratory (U.S.), Forest, and J. D. (James Donald) MacLean. Effect of Direction of Growth Rings On the Relative Amount of Shrinkage In Width and Thickness of Lumber and Effect of Radial and Tangential Shrinkage On Dimensions of Round Timbers. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1945.