1908. New York: Harper, 1908-10-12. 3 vols., various paginations and illustrations, fine copies in the original cloth-backed pictorial boards, all enclosed in a custom quarter morocco and silk folding box. § First edition, fine copies of these pioneer books which for the first time in children’s literature explored the concept..... More about The Hole Book. [and] The Slant Book. [and] The Rocket Book