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1968
January January; 67 (5): 505 - 570	February February; 67 (6): 637 - 692	March March; 67 (7): 743 - 803
April April; 67 (8): 861 - 961	May May; 67 (9): 1010 - 1079	June June; 67 (10): 1129 - 1175
July July; 67 (11): 1241 - 1307	August August; 67 (12): 1363 - 1427	September September; 68 (1): 81 - 169
October October; 68 (2): 123 - 187	November November; 68 (3): 235 - 285	December December; 68 (4): 331 - 409