6 books
Harcourt Science: Unit D, Cycles on Earth and in Space, Grade 5
Harcourt Science: Unit F, Exploring Energy and Forces, Grade 3
Harcourt Science: Unit A, Living Systems, Grade 5
Harcourt Science Looking at Ecosystems, Unit B
Harcourt Science Investigating Matter, Unit E
Harcourt Science the Solar System and Beyond, Unit D