Order of Ken Wilber books?

[Koeke]

I have only read half of "No Boundary" so far and skimmed through integral psychology and a brief history of everything. It seems to me that there is a lot of repetition in his books and between his books. Is a brief history of everything useful if you have read sex, ecology and spirituality? Is Integral spirituality useful if you have read The Religion of Tomorrow? 

So what books are unnecessary if you have read certain books and is there a certain order in which you should read them?

sorry if this topic doesn't belong on this subforum.

Edited June 11, 2021 by Koeke