Twin directories of OS:

[DIR]  ftp://ftp.eenet.ee/pub/cpan/authors/id/O/OS/
[DIR]  ftp://ftp.eenet.ee/arhiiv/apache/perl/mod_perl-2.0.2/xs/APR/OS/
[DIR]  ftp://ftp.eenet.ee/arhiiv/apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.eutelia.it/pub2/CPAN_Mirror/authors/id/O/OS/
[DIR]  ftp://ftp.fi.upm.es/pub/mirror/apache/perl/mod_perl-1.99_09/xs/APR/OS/
[DIR]  ftp://ftp.saintjoe.edu/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://17.254.0.79/developer/Development_Kits/Obsolete_Unsupported/OpenDoc_Development_Framework/ODFDev/ODF/OS/
[DIR]  ftp://ftp.kfki.hu/pub/packages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://62.128.1.71/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.rdc.cl/pub/Unix/Linux/Perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.barnyard.co.uk/cpm/walnut-creek-CDROM/BEEHIVE/OS/
[DIR]  ftp://ftp.efo.ru/pub/atmel/_ARM_MCUs_32bit/OS/
[DIR]  ftp://ftp.kreonet.re.kr/OS/
[DIR]  ftp://ftp.kreonet.re.kr/languages/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.cs.uni-bonn.de/pub/mirror/apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.cs.uni-bonn.de/pub/mirror/apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/linux/opensuse/repositories/home:/michaelmeissner/OS/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/contrib/sendmail/BuildTools/OS/
[DIR]  ftp://ftp.port80.se/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/src/lang/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.kulnet.kuleuven.ac.be/mirror/CPAN/authors/id/O/OS/
[DIR]  ftp://iraf.noao.edu/iraf/web/forums/m2f/includes/pear/OS/
[DIR]  ftp://ftp.uni-koeln.de/graph/khoros/2.1/OS/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.swin.edu.au/apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.swin.edu.au/apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/contrib/sendmail/BuildTools/OS/
[DIR]  ftp://ftp.mgts.by/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.cs.utk.edu/pub/rwhaley/OS/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/unix/perl/authors/id/O/OS/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/unix/apache/dist/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/unix/apache/dist/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.itu.edu.tr/Mirror/Apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.ut.ee/pub/unix/shells/tcsh/book/OS/
[DIR]  ftp://ftp.ut.ee/pub/languages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://24.215.0.24/CPAN/authors/id/O/OS/
[DIR]  ftp://24.215.0.24/apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://24.215.0.24/apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.uar.net/pub/apache/perl/mod_perl-2.0.2/xs/APR/OS/
[DIR]  ftp://ftp.uar.net/pub/apache/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.uar.net/pub/apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.dntis.ro/pub/.1/ftp.apache.org/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.dntis.ro/pub/.1/ftp.apache.org/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.dntis.ro/pub/.1/ftp.cpan.org/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.orient.net.ru/pub/unix/OS/Solaris-2.6/OS/
[DIR]  ftp://ftp.orient.net.ru/pub/unix/OS/
[DIR]  ftp://69.22.137.31/PUB/VAIO/OS/
[DIR]  ftp://ftp.atnet.ru/pub/OS/