ftp://core.ring.gr.jp/pub/X/opengroup/  direct

[DIR]individual/  direct  174 twin directories
[DIR]contrib/  direct  54605+ twin directories
[DIR]X11R7.4/  direct  26 twin directories
[DIR]X11R7.3/  direct  34 twin directories
[DIR]X11R7.2/  direct  32 twin directories
[DIR]X11R7.1/  direct  34 twin directories
[DIR]X11R7.0/  direct  40 twin directories
[DIR]X11R6.9.0/  direct  42 twin directories
[DIR]X11R6.8.2/  direct  41 twin directories
[DIR]X11R6.8.1/  direct  42 twin directories
[DIR]X11R6.8.0/  direct  42 twin directories
[DIR]R5contrib/  direct  51 twin directories