[Some aspects of fertility trends in Bulgaria since the beginning of the twentieth century and methods for their study].
Botev
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D000367:Age Factors; D002031:Bulgaria; D003267:Contraception; D003268:Contraception Behavior; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005193:Family Planning Services; D005298:Fertility; D008423:Maternal Age; D010290:Parents; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics
Age Factors; Bulgaria; Contraception; Contraceptive Methods Chosen; Contraceptive Usage; Demographic Factors; Developed Countries; Eastern Europe; Europe; Family Planning; Fertility--changes; Historical Survey; Maternal Age; Parental Age; Population; Population Characteristics; Population Dynamics