Blue Ribbon Press published a line of 'pop-up' books in the 1930s. They started with nursery rhyme characters like Mother Goose, Little Red Riding Hood and Puss in Boots. Soon after they moved into licensed characters, including Buck Rogers, Tarzan and this gem pictured above. This book commonly shows up for auction in the $80 - 100 range. Owing to age and fragility, they are rarely undamaged or completely intact. The one above is an exception. It's the best copy I've seen to date. It sold for $326.
Sticking with George Wunder, here is a rare charcoal on vellum illustration by him. The date is unknown. It's really beautifully done, and quite a departure from his strip work in terms of style. I'm becoming a Wunder fan more and more (and not just due to the subject matter). Sadly, this piece bears some heavy water damage on both sides. It sold for $84.