[SOME HYGIENIC PROBLEMS OF SHIFT EDUCATION. I. THE INFLUENCING OF THE DAILY REGIME OF CHILDREN].
D002648:Child; D003604:Czechoslovakia; D004493:Education; D006801:Humans; D012572:School Health Services
CZECHOSLOVAKIA; EDUCATION; SCHOOL HEALTH
N EKTER'E HYGIENICK'E PROBL'EMY SM ENN'EHO VYU COV'AN'I. I. OVLIVN EN'I RE ZIMU DNE D ET'I.