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1971
January January; 20 (1): 1 - 167	March March; 20 (2): 169 - 382
May May; 20 (3): 383 - 509	July July; 20 (4): 511 - 654
September September; 20 (5): 655 - 793	November November; 20 (6): 795 - 996 November; 20 (6, Part 2): 1018 - 1050