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Agric allowable shear stresses allowable stress Appendix basic stresses beams and stringers bending members Bulletin 108 checked beams Checks and splits clear specimens clear wood Corresponding to Various Douglas-fir dry lumber duration of load edition of ASTM effect from shakes factor of safety fail in shear Footnote Forest Products Laboratory Forest Service formulas fracture mechanics grade factor grade having one-half grading rules green lumber green material height horizontal shear joist and plank light building construction limit Markwardt middle one half moisture content Newlin's letter Percentage Strength Ratio piece split completely shake in green shake were present shakes and checks shakes or checks shear factor shear strength SIZE OF SHAKE straight-grained specimens strength of green strength of small Strength Ratios Corresponding stress in horizontal structural timbers tests of small Thickness of Piece two-beam theory U.S. Dep USDA variability VARIOUS COMBINATIONS Western hemlock Western larch width of end