[Rate of decrease in infant mortality in Poland in 1955-1964 as compared with other European countries].
D005060:Europe; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D011044:Poland
Tempo spadku umieralności niemowlat w Polsce w latach 1955-1964 w porównaniu z innymi krajami Europy.