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[Footnote 61: Bul. No. 8: Timber physics, Part II., 1893, p. 7.]

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[Footnote 62: Cir. 38: Instructions to engineers of timber tests, 1906, p. 24.]

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[Footnote 63: Warren, W.H.: The strength, elasticity, and other properties of New South Wales hardwood timbers, 1911, pp. 58-62.]

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