1931.8-1932.5 1931.4-1931.7 1931.1-1931.3 1931.1-1931.4 1931.2-1931.3 1931.4-1931.6 1931.7-1931.9 1932.1-1932.4 1932.5-1932.7 1932.6-1932.8