——: Die gewerblichen Eigenschaften der Hölzer. Stuttgart, 1890.

NORTH, A.T.: The grading of timber on the strength basis. Address before Western Society of Engineers. Lumber World Review, May 25, 1914, pp. 27-29.

NORTON, W.A.: Results of experiments on the set of bars of wood, iron, and steel, after a transverse stress. Van Nostrand's Eng. Mag., Vol. XVII, 1877, pp. 531-535.

PACCINOTTI E PERI: [Investigations into the elasticity of timbers.] Il Cimento, Vol. LVIII, 1845.

PALACIO, E.: Tensile tests of timber. La Ingenieria, Buenos Aires, May 31, 1903, et seq.

PARENT,—: Expériences sur la résistance des bois de chêne et de sapin. Mémoires de l'Académie des Sciences, 1707-08.

Propositions relatives à l'établissement d'un precédé uniforme pour l'essai des qualités techniques des bois. Proc. Int. Assn. Test. Mat., 1901, Annexe, pp. 13-28.

ROGERS, CHARLES G.: A manual of forest engineering for India. Vol. I, Calcutta, 1900, pp. 50-91.

RUDELOFF, M.: Der heutige Stand der Holzuntersuchungen. Mitt. a. d. königlichen tech. Versuchsanstalt, Berlin, IV, 1899.

——: Principles of a standard method of testing wood. Proc. Int. Assn. Test. Mat., 1906, 23 C, pp. 16.