I imagine that a project like that would suffer from definitions, which would make it even harder. Books, stories, pages, or panels? As Jim hinted, does Nyoka count as a jungle story? How does one count the Superman/Tarzan crossover (it was an Elseworld thing, don't panic)? How the heck do you file Detective Eye?
Still, I'd also love to see something along those lines, even if the above questions are swept quietly under the carpet.