As another long-time ERB fan, I have to second all of that. The Illustrated Tarzan Book is really a very cool, underrated book. For those that don't know, it reprints the first Tarzan daily strips by Foster, which adapts Tarzan of the Apes, the first novel in the series. If you've never seen Foster's B&W work, it has a different look than his later color Sundays - he's a bit freer and sketchier with his linework and often uses a lot of heavy black chiaroscuro-style, like that for which Caniff would become known for a few years later.
BZ, you're obviously a major ERB collector - I'm sure you have most of the pulps and McClurg firsts and I'd love to see some of them. I'd also love to see of ERB related comics - I sure you probably have a gorgeous Single Series 20, right? How about a Large Feature 5, Hi-Spot 2, Funnies 36, etc.? I would love to see some of these if you have them and get a chance to post them. Thank you again so much for sharing your amazing collection.