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1973
January January; 18 (1): 1 - 89	February February; 18 (2): 91 - 214	March March; 18 (3): 215 - 411
April April; 19 (1): 1 - 164	May May; 19 (2): 165 - 283	June June; 19 (3): 285 - 426 Supplement; 20 (Supplement): 1 - 130
July July; 20 (1): 1 - 125	August August; 20 (2): 127 - 265	September September; 20 (3): 267 - 419
October October; 21 (1): 1 - 204	November November; 21 (2): 205 - 441	December December; 21 (3): 443 - 544