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224. Articulation tests. Articulation tests of standard and modified interphones conducted during flight at 5,000 and 35,000 ft., with appendices concerning 1, interphone signal levels under various conditions, 2, temperatures encountered on high-altitude missions, and 3, articulation in B-26 bomber as function of air speed.

225. Fungi. Fungi and tropical deterioration, manual [with selected list of references]; prepared for Tropical Deterioration Steering Committee, by Selman A. Wakeman, assisted by E. S. Barghoorn, E T. Butler, G. A. Greathouse, J. G. Horsfall and W. G. Hutchinson. 3d edition.