Just as much fun was working my way through the Tarzan series, which contains maybe 30, 35 books..
Tarzan In Pellucidar still works.. ( last of the series )
I've heard of that story but haven't read it yet. I love Howard and Burroughs' work but I'm still working through it. I also have a ton of non-Conan Howard stories and non-Tarzan Burroughs stories, which I've only had time to read about half of so far. I read the first "John Carter of Mars" recently and thought it was one of the best stories I've read in years. Solomon Kane is another of my favorites.