title: [Assessment of infantile mortality levels in Poland's provinces in the years 1961-1970 by Perkal's size index method].
mesh_terms: D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D011044:Poland; D013223:Statistics as Topic
vernacular_title: Ocena poziomów umieralności niemowlat w województwach Polski w latach 1961--1970 za pomoca wskaźnika wielkości Perkala.