title: [Characteristics of the trends in the birth rate in Leningrad].
mesh_terms: D000367:Age Factors; D001723:Birth Rate; D005260:Female; D006801:Humans; D008297:Male; D012426:Russia; D012744:Sex Ratio; D014505:Urban Population
vernacular_title: K kharakteristike tendentsii rozhdaemosti v Leningrade.