title: [Changes occurring at middle age in the population of Plovdiv during the period of 1946-1947 to1956-1957].
mesh_terms: D002031:Bulgaria; D006801:Humans; D008017:Life Expectancy; D008433:Mathematics; D008875:Middle Aged; D011446:Prospective Studies
vernacular_title: Izmeneniia, nastupivshie v sredneĭ prodolzhitel'nosti zhizni naseleniia Plovdiva, za period s 1946-1947 g.g. po 1956-1957 g.g.