——: The Forest Products Laboratory: its purpose and work. Proc. Am. Soc. Test. Mat., Vol. X, 1910, pp. 477-489.
——: Specifications and grading rules for Douglas fir timber: an analysis of Forest Service tests on structural timbers. Proc. Am. Soc. Test. Mat., Vol. XI, 1911, pp. 744-766.
Comparative strength and resistance of various tie timbers. Elec. Traction Weekly, Chicago, June 15, 1912.
DAY, FRANK M.: Microscopic examination of timber with regard to its strength. 1883, pp. 6.
DEWELL, H.D.: Tests of some joints used in heavy timber framing. Eng. News, Mch. 19, 1914, pp. 594-598; et seq.
DÖRR, KARL: Die Festigkeit von Fichten- und Kiefernholz. Deutsche Bauzeitung, Berlin, Aug. 17, 1910. See also Zeitschrift d. ver. deutsch. Ing., Bd. 54, Nr. 36, 1910, p. 1503.
DUPIN, CHARLES: Expériences sur la flexibilité, la force, et l'élasticité des bois. Jour, de l'École Polytechnique, Vol. X, 1815.
DUPONT, ADOLPHE, et BOUQUET DE LA GRYE: Les bois indigènes et étrangers. Paris, 1875, pp. 273-352.
ESTRADA, ESTEBAN DUQUE: On the strength and other properties of Cuban woods. Van Nostrand's Eng. Mag., Vol. XXIX, 1883, pp. 417-426; 443-449.