03. Czech Pavilion (left); Soviet Pavilion (center); Bulgarian Pavilion (right) | V. Palla, V. Rudis & A. Jencek, Architects (Czech); Mikhail Posokhin, A.N. Krondratjev & V.A. Svirski, Architects (Soviet); T.N. Kojucharov, E.I. Tzvetkov & L.T. Christov, Architects (Bulgarian)