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1972
January January; 21 (1): 1 - 131	March March; 21 (2): 133 - 250
May May; 21 (3): 251 - 381	July July; 21 (4): 383 - 498
September September; 21 (5): 499 - 604 Supplement: 611 - 848	November November; 21 (6): 851 - 1008