Twin directories of 5.1:

[DIR]  ftp://ftp.ox.ac.uk/pub/comp/security/COAST/mirrors/vic.cc.purdue.edu/lsof/binaries/aix/5.1/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors/centos/5.1/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors/ftp.kde.org/pub/kde/stable/3.4.3/AIX/5.1/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/Linux/centos/5.1/
[DIR]  ftp://ftp.linux.ncsu.edu/mirror/mirror.centos.org/5.1/
[DIR]  ftp://ftp.kfki.hu/pub/packages/security/COAST/sysutils/lsof/binaries/aix/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/Documentation/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/FreeBSD/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/Linux/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/MacOSX/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/Solaris/5.1/
[DIR]  ftp://ftp.menandmice.com/pub/mmsuite/Windows/5.1/
[DIR]  ftp://ftp.wicks.co.nz/pub/linux/dist/centos/5.1/
[DIR]  ftp://ftp.rdc.cl/pub/Unix/centos/5.1/
[DIR]  ftp://ftp.ida.net/pub/software/eudora/macintosh/5.1/
[DIR]  ftp://ftp.ida.net/pub/software/eudora/windows_9x_2k/5.1/
[DIR]  ftp://ftp.pgroup.com/x86/5.1/
[DIR]  ftp://ftp.kreonet.re.kr/tools/doc-tools/nedit/contrib/highlighting/5.1/
[DIR]  ftp://ftp.kreonet.re.kr/tools/db/mysql/doc/refman/5.1/
[DIR]  ftp://ftp.lehigh.edu/pub/linux/redhat/updates/5.1/
[DIR]  ftp://ftp.3logic.net/pub/windows/drivers/video/ati/Catalist/5.1/
[DIR]  ftp://ftp.wustl.edu/pub/linux/distributions/centos/5.1/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/tcl/mirror/ftp.procplace.com/sorted/apps/moodss/5.1/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/tcl/mirror/ftp.procplace.com/sorted/packages-8.0/apps/moodss/5.1/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/linux/centos/5.1/
[DIR]  ftp://ftp.kde.org/pub/kde/Attic/3.4.3/AIX/5.1/
[DIR]  ftp://ftp.kde.org/pub/kde/Attic/koffice-1.4.2/AIX/5.1/
[DIR]  ftp://ftp.ai.kyutech.ac.jp/iso/CentOS/5.1/
[DIR]  ftp://cdsarc.u-strasbg.fr/1/catj.old/J/other/BaltA/5.1/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/src/lang/tcl/tcl/sorted/packages-8.0/apps/moodss/5.1/
[DIR]  ftp://ftp.swin.edu.au/centos/5.1/
[DIR]  ftp://ftp.swin.edu.au/freebsd/releases/alpha/ISO-IMAGES/5.1/
[DIR]  ftp://ftp.swin.edu.au/freebsd/releases/amd64/ISO-IMAGES/5.1/
[DIR]  ftp://ftp.swin.edu.au/freebsd/releases/i386/ISO-IMAGES/5.1/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/JGG/5.1/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/EM/restricted/5/5.1/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/EM/expmath/volumes/5/5.1/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/BJGA/5.1/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/Acrobatreader/mac/5.x/5.1/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/Acrobatreader/win/5.x/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/refman/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-backup-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-cluster-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-linuxunix-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-macosx-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-security-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-solaris-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-sourcebuild-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-startstop-excerpt/5.1/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Mysql/doc/mysql-windows-excerpt/5.1/