This By the 10's is one of the few DC titles that changed titles in midstream... and I can honestly say that I don't think I ever read any pre-Doom Patrol issues of My Greatest Adventure, so no comments on those...
Y'know, it does occur to me that maybe I've read some of these stories if they were reprinted in the 1970s...
Issue 40 - "Ice Age Giant" indeed!
Looking at these first seven covers of this By the 10's, I wonder how things would've worked out if someone at DC had created a group of adventurers who didn't have powers for this book... or maybe if the Challengers of the Unknown, Sea Devils, or other groups had been moved into this title!
Issue 80, and the Doom Patrol are introduced... and this title would never be the same again!
Issue 90, and the Doom Patrol's already taken over the title!
Issue 100 - man, they threw new stuff in the Doom Patrol that stuck all the time, didn't they?
Sadly, the original run of the Doom Patrol didn't last too long after this issue... and despite the attempts to revive the book, nothing seems to have really stuck. I had high hopes for John Byrne's revival, but even that didn't work out. At least there's Archives, although I'm still hoping for Showcase Presents The Doom Patrol!