[x]

FWIW, here's another long list.

It's hard to know what is important and lasting among recently published books. For every Freud or Einstein we remember, there were other writers and thinkers in the early 20th century who attracted great attention in their day and are now forgotten. And the same is true of more recent times. I can't imagine Mao or Freidan or Skinner will interest many readers a century from now. Another question is whether any modern work on, say philosophy, is likely to be as deep or comprehensive or seminal as the ancient philosophers' works were. It may indeed be possible, but later works do tend to be judged by lower standards to make such lists at all.

[headsonpikes]

Epictetus was one early omission which is included on your linked list. I agree with you that Mao, Friedan, and Skinner will be unread a century from now.

I pray, actually. ;^)

[Anitius Severinus Boethius]

Consolation of Philosophy is missing even from that list. Sad, it was widely regarded as one of the most important texts of the entire length of the Middle Ages.