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1991
January January; 21 (1): 2 - 81	March March; 21 (2): 85 - 144
May May; 21 (3): 147 - 226	July July; 21 (4): 227 - 296
September September; 21 (5): 297 - 342	November November; 21 (6): 371 - 443