This By the 10's features Comic Cavalcade, one of DC's Golden Age anthology titles that would feature at least rotating cover features, if not rotating features... It was a quarterly, and I think because this is "By the 10s" you'll initially see the covers with the golden age Green Lantnern, Wonder Woman and Flash on 'em... and then the funny animals take over!
Issue 10 - and I should note here that the covers would feature the three heroes pretty much just enjoying themselves!
Issue 30... ok, so the superheroes were gone by this issue... and the funny animals take over!
Issue 60! And the book only lasted another three issues after this!