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Bulletin 231 Volume 16 No.10 April 2002
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Bulletin 229 Volume 16 No8 October 2001
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Bulletin 201 Volume 14 No4 October 1994
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Bulletin 200 Volume 14 No3 July 1994
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Bulletin 196 Volume 13 No11 July 1993
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Bulletin 191 Volume 13 No6 April 1992
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Bulletin 172 Volume 11 No11 July 1987
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