[Birth rate levels in Poland 1946-1982].
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D001723:Birth Rate; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005298:Fertility; D011044:Poland; D011153:Population; D011157:Population Dynamics; D012106:Research; D012107:Research Design
Birth Rate--changes; Demographic Factors; Developed Countries; Eastern Europe; Europe; Fertility; Fertility Measurements; Measurement; Poland; Population; Population Dynamics; Research Methodology