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1957
January January; 20 (1): 1 - 122	March March; 20 (2): 125 - 227	May May; 20 (3): 230 - 324
July July; 20 (4): 329 - 451	September September; 20 (5): 453 - 551	November November; 20 (6): 553 - 625