"Board books." . . "Animals Fiction." . . "Lift-the-flap books." . . . . . . "Board book with flaps. 1-3yrs." . . . . . . . "A simple, rhythmic lift-the-flap book that has Baby opening the door to find a mouse, a cat, and even an elephant."@en . . . . . . . . "Children's stories"@en . "Children's stories" . . "Specimens" . . . "Knock! Knock! [board book]" . . "Surprises can help make birthdays fun and this toddler opens the door to find a surprise guest with a present each time he hears a knock, knock." . . . . "Fiction"@en . "Fiction" . . "Knock! knock!"@en . "Knock! knock!" . "Baby answers the knocks on the door to welcome a group of increasingly large animals bearing gifts. On board pages." . . . "Juvenile works" . "Juvenile works"@en . "Knock! Knock!" . . . . . . . . "Toy and movable books" . "Toy and movable books"@en . "Toy and movable books." . . "Gifts Fiction." . . . .