Shostakovich, Dimitri. (1906-1975) & Kabalevsky, Dmitry. (1904 - 1987) & Lutoslawski, Witold. (1913 - 1994) Signed PostcardOriginal signatures of Shostakovich, Vladigerov, Kabalevski, Dzerzhinsky and 11 additional Russian, Slavic and European classical composers, variously signed in black ink, blue ink and pencil on a picture postcard mailed from Prague to Chicago on May 5, 1957, during a meeting of the Union of Soviet Composers occuring at Prague Spring 1957. The identified signatures include: Slavko (Zlatic); Pancho Vladigerov; D(mitri) Kabalevski; D(mitri)