Twin directories of doc:

[DIR]  ftp://core.ring.gr.jp/pub/linux/debian/debian/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-4-0/src/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-4-0/src/dist/bind/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-4-0/src/share/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/dist/bind/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/sendmail/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/share/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-0/src/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-0/src/dist/bind/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-0/src/gnu/dist/sendmail/doc/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-0/src/share/doc/
[DIR]  ftp://core.ring.gr.jp/pub/misc/db/postgresql/dev/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-4-0/src/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-current/src/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-current/xsrc/xfree/xc/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-current/src/crypto/dist/heimdal/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-current/src/dist/bind/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-current/src/share/doc/
[DIR]  ftp://ftp.duth.gr/pub/LDP/linuxfocus/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gcc4/gcc/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gdb/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gdb6/bfd/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gdb6/gdb/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gdb6/readline/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gettext/gettext-runtime/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gettext/gettext-tools/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gmake/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/readline/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/tar/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/toolchain/bfd/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/toolchain/binutils/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/toolchain/gas/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/toolchain/gdb/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/toolchain/readline/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/xcvs/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/lib/libregex/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/lib/regex-0.12/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/usr.bin/gas/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/usr.bin/xcvs/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/lib/libc/DB/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/lib/libc/db/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/sys/arch/amiga/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/sys/arch/arm32/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/sys/dev/dm/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/dist/libpcap/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/dist/wpa/hostapd/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/dist/wpa/wpa_supplicant/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/dist/wpa_supplicant/doc/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/external/bsd/am-utils/dist/doc/