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Bulletin 213 Volume 15 No4 October 1997
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Bulletin 207 Volume 14 No10 April 1996
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Bulletin 189 Volume 13 No4 October 1991
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Bulletin 187 Volume 13 No2 April 1991
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Bulletin 173 Volume 11 No12 October 1987
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Bulletin 172 Volume 11 No11 July 1987
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Bulletin 161 Volume 10 No9 September 1984
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Bulletin 155 Volume 10 No3 October 1982
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Bulletin 146 Volume 9 No6 September 1979
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