Stroitel'stvo Sotsialisma v Narodnoi Respublike Bolgarii [Building Socialism in the People's Republic of Bulgaria]
Moskva: Izdatel'stvo "Znanie," 1955. 8vo. Wraps. 39 p. Seriia I, No. 22. Text in Russian. [88347]
Moskva: Izdatel'stvo "Znanie," 1955. 8vo. Wraps. 39 p. Seriia I, No. 22. Text in Russian. [88347]