1992.
First discovery book
Introduces the behavior and life cycle of cats. Features acetate overlays to hide and then reveal information.
Book
1993.
First discovery book
Transparent overlays provide information on the inner framework of a ship, different kinds of ships, and their uses.
Book
1993.
First discovery book
Transparent overlays depict the plant and animal life found along a river and how rain and winter can change the river.
Book