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[Footnote 51: Cir. 39. Experiments on the strength of treated timber, p. 18.]

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[Footnote 52: Ibid., p. 21. See also Cir. 108, p. 19, table 5.]

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[Footnote 53: Hatt, W. K.: Experiments on the strength of treated timber. Cir. 39, U.S. Forest Service, 1906, p. 31.]

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