Béla BIRKAS (1929-1973). Three preparatory studies for "Guernica dU Vietnam", 1970. Gouache, pastel and charcoal on paper signed and dated 70 lower right (tears and folds at edges). Height 37 cm - Width 100 cm Another preparatory study of the same painting, circa 1970, gouache on paper (tears). Height : 18 cm - Width : 82 cm Provenance: Artist's studio