Lea, Hon. Clarence F. The Aircraft Investigation. Washington, GPO, 1920. 28pp, 5.5x9", wrps, stapled. Lengthy text of a speech by Rep. Lea of California which is very critical of U.S. aircraft production in WWI. Lots of information on the DH-4, the only combat aircraft produced in the U.S. Fascinating reading. About fair; ink scribbles on front cover, else good.