Almost eight hundred drawings, all done by Mirko Hanák. This is not the film that Hanna-Barbera made, but an unproduced version spearheaded by Gene Deitch. You can learn more about the history of the project here (with correspondence from E. B. White himself) and here. The full storyboard is contained in four folders (A, B, C, D), each with its own slideshow. Enjoy!