I used to have the original black cover version. Long lost, sadly. I have it as an ebook though. The one Star Trek book from my youth I had to buy once when I saw it used was this one, which used to be canon until TNG threw almost all of it away. But Rick Sternbach illustrated it and the ideas are pretty fun.
I think my favorite part is when an Earth expedition to Alpha Centauri meets Zefram Cochrane (TOS says he is from Alpha Centauri and there’s a lot of headcanon to explain it) and learns to communicate to him through mathematics. At the beginning, Cochrane draws a circle with a symbol next to it, the Earth mathematician realizes that it means pi and they move on from there.