[Changes in the development of German youngsters in the 20th century].
D000293:Adolescent / Q000523:psychology; D002648:Child; D005006:Ethnicity; D006801:Humans; D007604:Juvenile Delinquency / Q000523:psychology*; D000297:Psychology, Adolescent; D002666:Psychology, Child
ADOLESCENCE/psychology; CHILD PSYCHOLOGY; JUVENILE DELINQUENCY/psychology