Origins.

v.20 no.30-48 Jan.3-May 9 199; v.21 no.1-24 May 16-Nov.21 19; v.21 no.25-48 Nov.28-1991-May; v.22 no.25-48 Dec.3 1992-May; v.22 no.1-24 May 14-Nov.26 19; v.23 no.25-46 Dec.2 1993-May; v.23 no.1-24 May 20-Nov.25 19; v.24 no.1-28 May 19-Dec.22 19; v.24 no.29-47 1995 Jan-May 11; v.25 no.1-24 1995 May-Nov.; v.25 no.25-47 1995/96 Dec-May; v.26 no.1-23 1996 May-Nov.; v.26 no.24-47 Nov.'96-May '97; v.27 no.1-24 1997 May-Nov.; v.27 no.25-47 Dec.'97-May'98; v.28 no.1-24 1998 May-Nov.; v.28 no.25-47 Dec 3 1998-May 13; v.29 no.25-47 Dec 2 1999-May 11; v.30 no.25-47 Nov 30 2000-May 1; v.31 no.1-25 2001 May 17-Nov.; v.31 no.26-47 2001/2002 Dec.6; v.32 no.1-25 2002 May 16-Nov.; v.32 no.26-47 2002 Dec.5-2003; v.33 no.1-25 2003 May 15-Nov.; v.33 no.26-48 2003 Dec.4-2004; v.34 no.1-24 2004 May 20-Nov.; v.34 no.25-47 2004 Dec.2-2005; v.35 no.1-28 2005 May 19-Dec.; v.35 no.29-47 2006 Jan.5-May; v.36 no.1-28 2006 May 18-Dec.2; v.36 no.29-47 2007 Jan-May 10; v.37 no.1-25 2007 May 17-Nov.; v.37 no.26-47 2007 Dec.6-2008; v.29 no.1-24 May 20 1999-Nov 25; v.30 no.1-24 May 18 2000-Nov 23