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vol. 39, no. 8
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vol. 40, no. 7
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vol. 48, no. 5
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vol. 48, no. 8
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vol. 50, no. 5
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vol. 52, no. 5
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vol. 53 (1988), no. 3
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vol. 53 (1989), no. 2
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vol. 58, no. 3
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vol. 58, no. 4
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vol. 61, no. 2
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vol. 62, no. 2
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vol. 63, no. 2
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vol. 63, no. 4
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vol. 64, no. 2
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vol. 65, no. 2
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vol. 66, no. 2
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vol. 67, no. 2