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1931
January January; 20 (1): 1 - 84	February February; 20 (2): 85 - 185	March March; 20 (3): 187 - 258
April April; 20 (4): 259 - 332	May May; 20 (5): 333 - 393	June June; 20 (6): 395 - 481 June; 20 (Index): 483 - 490
July July; 21 (1): 1 - 84	August August; 21 (2): 85 - 170	September September; 21 (3): 171 - 253
October October; 21 (4): 255 - 340	November November; 21 (5): 341 - 415	December December; 21 (6): 417 - 515