Twin directories of knuth:

[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/obsolete/systems/knuth/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/systems/knuth/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/info/knuth/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/systems/knuth/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/obsolete/systems/knuth/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/info/knuth/
[DIR]  ftp://ftp.uni-koeln.de/tex/systems/knuth/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/latex/dante/systems/knuth/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/latex/dante/info/knuth/
[DIR]  ftp://24.215.0.24/CTAN/obsolete/systems/knuth/
[DIR]  ftp://24.215.0.24/CTAN/systems/knuth/
[DIR]  ftp://24.215.0.24/CTAN/info/knuth/
[DIR]  ftp://ftp.sztaki.hu/pub/tex/systems/knuth/
[DIR]  ftp://ftp.sztaki.hu/pub/tex/info/knuth/
[DIR]  ftp://ftp.tug.ctan.org/pub/tex-archive/obsolete/systems/knuth/
[DIR]  ftp://ftp.tug.ctan.org/pub/tex-archive/systems/knuth/
[DIR]  ftp://ftp.tug.ctan.org/pub/tex-archive/info/knuth/
[DIR]  ftp://ftp.asu.ru/incoming/forBelikovAndBushin/latex/texmf/doc/knuth/
[DIR]  ftp://ftp.tug.org/texlive/Contents/live/texmf-doc/doc/english/knuth/
[DIR]  ftp://ftp.tug.org/historic/systems/knuth/
[DIR]  ftp://ftp.tu-ilmenau.de/Mirrors/tex/obsolete/systems/knuth/
[DIR]  ftp://ftp.tu-ilmenau.de/Mirrors/tex/systems/knuth/
[DIR]  ftp://ftp.tu-ilmenau.de/Mirrors/tex/info/knuth/
[DIR]  ftp://ftp.cvut.cz/mirrors/ctan.org/obsolete/systems/knuth/
[DIR]  ftp://ftp.cvut.cz/mirrors/ctan.org/systems/knuth/
[DIR]  ftp://ftp.cvut.cz/mirrors/ctan.org/info/knuth/
[DIR]  ftp://ftp1.sinica.edu.tw/pub1/tex/systems/knuth/
[DIR]  ftp://ftp.botik.ru/rented/znamensk/CTAN/systems/knuth/
[DIR]  ftp://ftp.botik.ru/rented/lib/tex/texmf/doc/knuth/
[DIR]  ftp://ftp.int.ru/.1/CTAN/obsolete/systems/knuth/
[DIR]  ftp://ftp.int.ru/.1/CTAN/systems/knuth/
[DIR]  ftp://ftp.int.ru/.1/CTAN/info/knuth/
[DIR]  ftp://147.52.159.12/mirrors/CTAN/systems/knuth/
[DIR]  ftp://147.52.159.12/mirrors/CTAN/obsolete/systems/knuth/
[DIR]  ftp://147.52.159.12/mirrors/CTAN/info/knuth/
[DIR]  ftp://ftp.cs.rpi.edu/mirrors/tex-archive/systems/knuth/
[DIR]  ftp://ftp.cs.rpi.edu/mirrors/tex-archive/obsolete/systems/knuth/
[DIR]  ftp://ftp.cs.rpi.edu/mirrors/tex-archive/info/knuth/
[DIR]  ftp://ftp.informatik.uni-hamburg.de/pub/soft/tex/systems/knuth/
[DIR]  ftp://ftp.informatik.uni-hamburg.de/pub/soft/tex/obsolete/systems/knuth/
[DIR]  ftp://ftp.informatik.uni-hamburg.de/pub/soft/tex/info/knuth/
[DIR]  ftp://ftp.uni-wuppertal.de/pub/TeX/systems/knuth/
[DIR]  ftp://ftp.uni-wuppertal.de/pub/TeX/obsolete/systems/knuth/
[DIR]  ftp://ftp.uni-wuppertal.de/pub/TeX/info/knuth/
[DIR]  ftp://ftp.uni-augsburg.de/mirrors/misc/ftp.dante.de/tex-archive/systems/knuth/
[DIR]  ftp://ftp.uni-augsburg.de/mirrors/misc/ftp.dante.de/tex-archive/obsolete/systems/knuth/
[DIR]  ftp://ftp.uni-augsburg.de/mirrors/misc/ftp.dante.de/tex-archive/info/knuth/
[DIR]  ftp://ftp.di.uminho.pt/pub/ctan/systems/knuth/
[DIR]  ftp://ftp.di.uminho.pt/pub/ctan/obsolete/systems/knuth/
[DIR]  ftp://ftp.di.uminho.pt/pub/ctan/info/knuth/