I just finished reading this and found that there are multiple editions out that aren't combined. I'm including two that I know should be combined, as others may be adaptations. Should I include the others as well?
There is some difficulty, the book was originally published in two parts. So some editions are only part 1, some part 2 and and some both parts. Your first link is currently marked as part 1, the second link as both parts. If that is correct, they shouldn't be combined with each other.
/book/show/2...
/book/show/9...