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1981
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January
January; 19 (1): 1 - 186 |
March
March; 19 (2): 187 - 354 |
May
May; 19 (3): 355 - 528 |
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July
July; 20 (1): 1 - 235 |
September
September; 20 (2): 237 - 451 |
November
November; 20 (3): 453 - 714 |
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