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1981
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January
January; 153 (1): 1 - 218 |
February
February; 153 (2): 219 - 499 |
March
March; 153 (3): 500 - 751 |
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April
April; 153 (4): 752 - 1026 |
May
May; 153 (5): 1027 - 1376 |
June
June; 153 (6): 1377 - 1695 |
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July
July; 154 (1): 1 - 221 |
August
August; 154 (2): 222 - 580 |
September
September; 154 (3): 581 - 1001 |
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October
October; 154 (4): 1002 - 1260 |
November
November; 154 (5): 1261 - 1714 |
December
December; 154 (6): 1715 - 1975 |
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