Wood grading, lumber grading, grading, mechanical properties, lumber, timber, timber grading, railroad ties, standards, bending, elasticity, modulus of elasticity, wood quality, flexure, stress grading, nondestructive testing, engineering design, wood defects, structural timbers, roundwood, round timbers, wood strength, logs, bending strength, LRFD, load factor design, allowable stress design, ASD, design properties
Wood handbook : wood as an engineering material: chapter 7. Centennial ed. General technical report FPL ; GTR-190. Madison, WI : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2010: p. 7.1-7.16.