Cycle world.

v.13 1974; v.14 1975; v.15 1976; v.16 1977; v.20 1981; v.21 1982; v.22 1983; v.23 1984; v.24 1985; v.25 1986; v.26 1987; v.27 1988; v.28 1989; v.29 1990; v.30 1991; v.31 1992; v.32 1993 (Bound without Jul-Aug); v.32 1993 Jul-Aug; v.33 1994 Jan-Jun; v.33 1994 Jul-Dec; v.34 1995 Jan-Jun; v.34 1995 Jul-Nov; v.35 1996 Jan-Jun; v.35 1996 Jul-Dec; v.36 1997 Jan-Dec (Bound without Jan, May, Jul, Sep and Nov); v.37 1998 Jul-Dec (Bound without Sep); v.38 1999 Jul-Dec; v.38 1999 Jan-Jun (Bound without Mar-Apr); v.39 2000 Jan-Jun; v.39 2000 Jul-Dec; v.40 2001 Jan-Jun; v.40 2001 Jul-Dec; v.41 2002 Jan-May; v.42 2003 Jan-Jun; v.43 2004 Jan-Jun; v.43 2004 Jul-Dec; v.44 2005 Jan-Jun (Bound without Feb); v.44 2005 Jul-Dec; v.45 2006 Jan-Jun; v.45 2006 Jul-Dec; v.46 2007 Jan-Jun