A challenge to youths: summer 1968.
D000293:Adolescent; D004651:Employment; D005260:Female; D006281:Health Occupations / Q000193:education*; D006285:Health Planning; D006280:Health Workforce; D006801:Humans; D008297:Male; D009042:Motivation; D009934:Organization and Administration; D011203:Poverty; D014505:Urban Population