[METHODS USED IN THE STUDY OF ENVIRONMENTAL FACTORS].
D000293:Adolescent; D002648:Child; D002669:Child Welfare; D003604:Czechoslovakia; D004777:Environment; D006801:Humans; D006920:Hygiene; D012106:Research; D013222:State Medicine
ADOLESCENCE; CHILD; CHILD WELFARE; CZECHOSLOVAKIA; ENVIRONMENT; HYGIENE; STATE MEDICINE
K MET'ODAM POU Z'IVAN'YM K  ST'UDIU FAKTOROV PROSTREDIA.