Keywords: Public opinion History ; 20th century ; Cuba ; Public opinion Sources ; History ; 20th century ; Cuba ; Influence (Literary, artistic, etc.) ; Intellectual life ; International relations ; Military participation Cuban ; Public opinion ; Public opinion, Cuban ; Public opinion History 20th century ; Spain History ; Foreign public opinion, Cuban ; Civil War, 1936-1939 ; Spain History ; Influence ; Civil War, 1936-1939 ; Spain History ; Participation, Cuban ; Civil War, 1936-1939 ; Cuba Intellectual life ; 20th century ; Cuba Sources ; Intellectual life ; 20th century ; Spain Relations ; Cuba ; Cuba Relations ; Spain ; Cuba ; Spain ; History ; Sources ; Spain History Civil War, 1936-1939 ; Foreign public opinion, Cuban ; Cuba Intellectual life 20th century ; Aufsatzsammlung ; Aufsatzsammlung ; Kuba ; Intellektueller ; Spanischer Bürgerkrieg ; Kuba ; Intellektueller ; Spanischer Bürgerkrieg ; Öffentliche Meinung