[Role of prematurity in the birth rate & infant death rate in Liberec county from 1953 to 1956].
D001723:Birth Rate; D006801:Humans; D007223:Infant; D066088:Infant Death; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D014798:Vital Statistics
INFANT MORTALITY; VITAL STATISTICS
Podíl nedonosených dĕtí na natalitĕ a na kojenecké úmrtnosti v Libereckém kraji v letech 1953 az 1956.