The complete TeX source (DVI)(tex.loria.fr)
tex.loria.fr
The complete TeX source (DVI)
http://tex.loria.fr/tex-source/tex-source.html
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The above is a typeset book version (so in DVI form, is misleadingly named). For the actual source, see http://tug.ctan.org/pub/tex-archive/systems/knuth/dist/tex/t...