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1950
January January; 13 (1): 1 - 109	March March; 13 (2): 113 - 186	May May; 13 (3): 189 - 265
July July; 13 (4): 269 - 305	September September; 13 (5): 321 - 391	November November; 13 (6): 395 - 488