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1971
January January; 20 (1): 1 - 57	February February; 20 (2): 65 - 118	March March; 20 (3): 129 - 181
April April; 20 (4): 193 - 249	May May; 20 (5): 257 - 309	June June; 20 (6): 385 - 442
July July; 20 (7): 449 - 503	August August; 20 (8): 513 - 559	September September; 20 (9): 577 - 634
October October; 20 (10): 641 - 706	November November; 20 (11): 721 - 775	December December; 20 (12): 785 - 838