Twin directories of trees:

[DIR]  ftp://ftp.mimuw.edu.pl/mirror/ftp.redhat.com/pub/redhat/linux/6.2/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.eenet.ee/pub/cpan/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.eutelia.it/pub2/CPAN_Mirror/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.saintjoe.edu/pub/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/latex209/contrib/trees/
[DIR]  ftp://ftp.linux.ncsu.edu/pub/ncsuscyld/i386/misc/src/trees/
[DIR]  ftp://ftp.linux.ncsu.edu/pub/realmlinux/realmkit-6.2/i386/misc/src/trees/
[DIR]  ftp://ftp.x.org/R5contrib/trees/
[DIR]  ftp://ftp.kfki.hu/pub/packages/perl/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://62.128.1.71/pub/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.rdc.cl/pub/Unix/Linux/Perl/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/latex209/contrib/trees/
[DIR]  ftp://ftp.kreonet.re.kr/languages/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.robots.ox.ac.uk/pub/outgoing/jmac/trees/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/misc/grant/pkgstat/20040711.1811/leftovers-sun4u/usr/pkg/share/genecys/arch/plants/trees/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/misc/grant/pkgstat/20040716.0710/leftovers-sun4u/usr/pkg/share/genecys/arch/plants/trees/
[DIR]  ftp://ftp.port80.se/pub/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/src/lang/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.kulnet.kuleuven.ac.be/mirror/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.uni-koeln.de/tex/macros/latex209/contrib/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/it/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/ja/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/fr/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/de/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.2/cpan/CPAN-archive/authors/id/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.2/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.0/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.0/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.0/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.1/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.1/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/6.1/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/2.0/en/os/i386/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/4.2/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/4.2/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/4.2/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.0/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.0/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.1/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.1/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.1/en/os/sparc/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.2/en/os/alpha/misc/src/trees/
[DIR]  ftp://ftp.uni-koeln.de/mirrors/redhat.com/redhat/linux/5.2/en/os/i386/misc/src/trees/
[DIR]  ftp://ftp.ednet.ns.ca/pub/its/linux/RedHat/i386/misc/src/trees/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/latex/dante/macros/latex209/contrib/trees/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/CPAN/authors/id/T/TO/TOMC/scripts/CS-Talk/source/dstructs/trees/