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1991
January January; 19 (1): - 1 - 98	March March; 19 (2): - 103 - 203	June June; 19 (3): - 209 - 327
July July; 19 (4): - 331 - 421	September September; 19 (5): - 427 - 560	December December; 19 (6): - 565 - 672