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I think of The Art of Computer Programming... https://en.wikipedia.org/wiki/The_Art_of_Computer_Programming https://en.wikipedia.org/wiki/The_Art_of_Computer_P

• blahedo 1y ago
  Definitely belongs on the list; notable not just because it's a slow/long project spanning 60 years and counting, but because part of it included the side trip to write TeX and METAFONT in order to be able to write and typeset the rest of TAOCP properly.