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1968
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January
January; 51 (1): 1 - 122 |
February
February; 51 (2): 125 - 276 |
March
March; 51 (3): 279 - 442 |
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April
April; 51 (4): 445 - 587 |
May
May; 51 (5): 1 - 700 |
June
June; 51 (6): 703 - 801 |
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July
July; 52 (1): 1 - 318 |
August
August; 52 (2): 181 - 386 |
September
September; 52 (3): 389 - 713 |
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October
October; 52 (4): 559 - 713 |
November
November; 52 (5): 717 - 853 |
December
December; 52 (6): 855 - 985 |
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