Links
| Row | Title | Download | Type | |
|---|---|---|---|---|
| 1981 | Letter 44 |  |  |
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| 1982 | Letter 45 | | |
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| 1983 | Letter 46 | | |
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| 1984 | Letter 48 | | |
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| 1985 | Letter 49 | | |
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| 1986 | Letter 5 | | |
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| 1987 | Letter 50 | | |
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| 1988 | Letter 51 | | |
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| 1989 | Letter 52 | | |
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| 1990 | Letter 54 | | |
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| 1991 | Letter 55 | | |
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| 1992 | Letter 57 | | |
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| 1993 | Letter 58 | | |
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| 1994 | Letter 59 | | |
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| 1995 | Letter 6 | | |
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| 1996 | Letter 60 | | |
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| 1997 | Letter 61 | | |
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| 1998 | Letter 62 | | |
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| 1999 | Letter 63 | | |
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| 2000 | Letter 64 | | |
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| 2001 | Letter 65 | | |
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| 2002 | Letter 66 | | |
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| 2003 | Letter 67 | | |
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| 2004 | Letter 68 | | |
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| 2005 | Letter 69 | | |
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| 2006 | Letter 7 | | |
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| 2007 | Letter 70 | | |
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| 2008 | Letter 71 | | |
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| 2009 | Letter 72 | | |
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| 2010 | Letter 73 | | |