Archive of 1968 Online Issues:

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January
January; 50 (1): 1 - 210
March
March; 50 (2): 211 - 438
April
April; 50 (3): 439 - 641
June
June; 50 (4): 643 - 850
July
July; 50 (5): 851 - 1080
September
September; 50 (6): 1081 - 1280
October
October; 50 (7): 1281 - 1504
December
December; 50 (8): 1505 - 1710