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1990
January January; 12 (1): 3 - 33	March March; 12 (2): 39 - 80
May May; 12 (3): 87 - 130	July July; 12 (4): 135 - 175
September September; 12 (5): 179 - 216	November November; 12 (6): 223 - 258