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1991
January January; 13 (1): 3 - 37	March March; 13 (2): 43 - 79
May May; 13 (3): 83 - 126	July July; 13 (4): 131 - 170
September September; 13 (5): 175 - 218	November November; 13 (6): 223 - 263