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Podobrjavane kulturno-bitovite uslov̀ija na selo dobližavaneto im do tezi v grada
Kolarov, Ivan, (1970)
Preodoljavane na sǔštestvenite različija meždu grada i seloto v Bŭlgarija : Rusev, L[juben], N[ikolina] Ilieva
Rusev, Ljuben, (1963)
The gift of freedom : a study of the economic and social status of wage earners in the United States
(1949)