found: Campbell, R. Dear zoo : a lift-the-flap book, 2007.
found: Tyrrell, M. Let's count bugs : a slide-and-peek book, c1998.
found: Shippensburg Public Library website, Aug. 2, 2006(Lift-the-flap books; have cardboard flaps that children can open and close throughout the story; they make books more hands-on and interactive)
found: Understanding children's book genres, via WWW, July 30, 2014(Lift-the flaps)
found: Glossary of pop-up terms, via WWW, July 30, 2014(Flaps: One or more illustrated papers glued at one point. Lifting a flap exposes the illustration directly beneath it (see Lift-the-flap); Lift-the-flap: A single piece of paper attached to the base page at a single point which covers an illustration, text, or a movable illustration. 'Lifting the flap' exposes the base page's illustration, text, or movable.)
found: LCSH(Lift-the-flap books. BT Toy and movable books)