Seems very light on math also, with just three texts on it. As much as I respect Bertrand Russell, I'm not sure if _Principia Mathematica_ is the last word on mathematics for the century.
Ironically, Knuth has stated that his idea of _Literate Programming_ is more important than TAoCP.
> As much as I respect Bertrand Russell, I'm not sure if _Principia Mathematica_ is the last word on mathematics for the century.
I feel like they picked it because not much original mathematics is published in book form. Most of the work that shaped the century in mathematics was published as papers.
They might also have picked it because Russell published books that are readable by laypeople, so in the unlikely event that someone tried to read Principia Mathematica because of this list, they could put it down and pick something else by Russell to read instead.
Ironically, Knuth has stated that his idea of _Literate Programming_ is more important than TAoCP.