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1989 vol. 40, no. 3 vol. 41, no. 1 vol. 41, no. 2 vol. 41, no. 5 vol. 41, no. 6 vol. 41, no. 7 vol. 41, no. 8 vol. 41, no. 9 vol. 41, no. 10 vol. 41, no. 11 vol. 41, no. 12