Twin directories of groff:

[DIR]  ftp://ftp.dit.upm.es/linux/ubuntu-6.06.1/ubuntu-6.06.1/pool/main/g/groff/
[DIR]  ftp://ftp.linux.it/ubuntu/pool/main/g/groff/
[DIR]  ftp://ftp.linux.it/debian/pool/main/g/groff/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu/groff/
[DIR]  ftp://134.121.1.1/pub/gnu.OLD/groff/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.2/pub/gnu/groff/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.1/pub/gnu/groff/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.0/pub/gnu/groff/
[DIR]  ftp://134.121.1.1/.snapshot/hourly.1/pub/gnu/groff/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.1/source/ap/groff/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-current/source/ap/groff/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-11.0/source/ap/groff/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.0/source/ap/groff/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/groff/
[DIR]  ftp://ftp.cesca.es/mirror/debian/pool/main/g/groff/
[DIR]  ftp://ftp.saintjoe.edu/pub/linux/slackware/slackware-current/source/ap/groff/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors3/debian.org/debian/pool/main/g/groff/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors3/backports.org/pool/main/g/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/metapost/base/texmf/fonts/afm/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/metapost/base/texmf/fonts/enc/dvips/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/metapost/base/texmf/fonts/map/dvips/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/metapost/base/texmf/fonts/tfm/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/metapost/base/texmf/fonts/type1/groff/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/gnu/groff/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/slackware/source/ap/groff/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/debian/pool/main/g/groff/
[DIR]  ftp://ftp.hpl.hp.com/gatekeeper/pub/cygwin/release/groff/
[DIR]  ftp://aeneas.mit.edu/pub/gnu/groff/
[DIR]  ftp://debian.lcs.mit.edu/pub/debian-amd64/debian-amd64/pool/main/g/groff/
[DIR]  ftp://debian.lcs.mit.edu/pub/debian-amd64/debian/pool/main/g/groff/
[DIR]  ftp://debian.lcs.mit.edu/debian/pool/main/g/groff/
[DIR]  ftp://ftp.kfki.hu/pub/linux/ubuntu/pool/main/g/groff/
[DIR]  ftp://ftp.kfki.hu/pub/linux/debian/pool/main/g/groff/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/ports/local-distfiles/okazaki/groff/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/ports/japanese/groff/
[DIR]  ftp://ftp.cprm.net/.disk0/slackware/slackware-12.1/source/ap/groff/
[DIR]  ftp://ftp.armedslack.org/armedslack/armedslack-11.0/source/ap/groff/
[DIR]  ftp://ftp.armedslack.org/armedslack/armedslack-current/source/ap/groff/
[DIR]  ftp://ftp.farlep.net/pub/Windows/CYGWIN/groff/
[DIR]  ftp://ftp.farlep.net/pub/linux/Slackware-12.0/d4/source/ap/groff/
[DIR]  ftp://ftp.scw.net.br/pub/slamd64/slamd64-12.2/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-current/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-11.0/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.0/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.1/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/debian.org/pool/main/g/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.2/source/ap/groff/
[DIR]  ftp://ftp.skynet.be/mirror1/backports.org/pool/main/g/groff/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/graphics/metapost/base/texmf/fonts/afm/groff/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/graphics/metapost/base/texmf/fonts/enc/dvips/groff/