Changing approach to epidemiology, prevention, and amelioration of trauma: Transition to approaches etiologically rather than descriptively based [address] by William Haddon, jr., Director, National Highway Safety Bureau, Federal Highway Administration, Department of Transportation, presented at 95th annual meeting of American Public Health Association, Program on epidemiology of traffic accidents, Oct. 26, 1967. Miami Beach, Fla. [with list of references].