Twin directories of reference:

[DIR]  ftp://ftp.tcp.co.uk/pub/reference/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/devices/reference/
[DIR]  ftp://ftp.sdsmt.edu/pub/choralnet/reference/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/studying/services/studyskills/reference/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/reference/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/en/reference/
[DIR]  ftp://ftp.avc-pioneer.com/Mtfuji_3/reference/
[DIR]  ftp://ftp.avc-pioneer.com/Mtfuji_4/reference/
[DIR]  ftp://ftp.avc-pioneer.com/Mtfuji_6/Proposal/FEB05/Toshiba/reference/
[DIR]  ftp://ftp.qrz.ru/pub/hamradio/reference/
[DIR]  ftp://ftp.epson.it/pub/manuals/inkjet/C64C63/reference/
[DIR]  ftp://ftp.epson.it/pub/manuals/inkjet/C84/reference/
[DIR]  ftp://ftp.efo.ru/pub/atmel/_AVR_MCUs_8bit/_Technical_Library/tools/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/non-gnu/sdx/docs/html/doc-sdx2/fr/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/non-gnu/sdx/sdx/docs/html/doc-sdx2/fr/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/shishi/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/non-gnu/distwork/docs/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/non-gnu/gchemutils/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/non-gnu/ghosts/gedcomparser/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gnutls/gnutls/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gnutls/manual/libtasn1/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gnutls/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gsasl/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gss/reference/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/libidn/reference/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-5_BETA/xsrc/xfree/xc/extras/freetype2/docs/reference/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/contrib/openbsm/test/reference/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/xfree/xc/extras/freetype2/docs/reference/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/dist/freetype/docs/reference/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/external/mit/freetype/dist/docs/reference/
[DIR]  ftp://ftp.inescn.pt/pub/util/.+eclipse/technology/linuxtools/N200904221802/eclipse/plugins/org.eclipse.cdt.doc.user_5.0.0.200806171202/reference/
[DIR]  ftp://ftp.inescn.pt/pub/util/.+eclipse/technology/linuxtools/N200904221802/eclipse/plugins/org.eclipse.cdt.doc.user/reference/
[DIR]  ftp://ftp.inescn.pt/pub/util/.+eclipse/technology/linuxtools/N200904221802/testing/target/eclipse/dropins/cdt/eclipse/plugins/org.eclipse.cdt.doc/reference/
[DIR]  ftp://ftp.cs.kuleuven.be/pub/Ada-Belgium/mirrors/pal/ajpo/tools/bindings/ASIS/files/reference/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/eclipse/technology/ohf/stem/help/latest/reference/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/contrib/openbsm/test/reference/
[DIR]  ftp://ftp.seagate.com/pub/acrobat/reference/
[DIR]  ftp://ftp.linux.org.uk/LDP/LDP/khg/HyperNews/get/devices/reference/
[DIR]  ftp://194.117.24.2/pub/util/.+eclipse/technology/ohf/stem/help/latest/reference/
[DIR]  ftp://sapi.vlsm.org/debianwww/doc/manuals/reference/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/xfree/xc/extras/freetype2/docs/reference/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/dist/freetype/docs/reference/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/external/mit/freetype/dist/docs/reference/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/contrib/openbsm/test/reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/technology/ohf/stem/help/latest/reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/rt/ecf/2.1Test/3.4/tmp/eclipse/plugins/org.eclipse.ecf.core.source_2.1.0.v20090128-1800/src/org.eclipse./reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.jdt.doc.isv/reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.jdt.doc.user/reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.platform.doc.isv/reference/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.platform.doc.user/reference/