[F. Engels on the health and physical development of children].
D002648:Child; D002657:Child Development; D003148:Communism / Q000266:history; D004739:England; D006262:Health / Q000266:history; D049672:History, 19th Century; D006801:Humans; D010806:Physical Education and Training; D014586:USSR
F. Engel's o zdorov'e i fizicheskom razvitii deteĭ.