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1991
January January; 19 (1): 2 - 98	March March; 19 (2): 103 - 203	May May; 19 (3): 210 - 327
July July; 19 (4): 332 - 421	September September; 19 (5): 428 - 533	November November; 19 (6): 565 - 672