11 books • 4 series
Let's Explore Solids (Bumba Books (R) -- A First Look at Physical Science) (A First Look at Physical Science)
Let's Explore Gases (Bumba Books (R) -- A First Look at Physical Science) (A First Look at Physical Science)
Let's Explore Liquids (Bumba Books (R) -- A First Look at Physical Science) (A First Look at Physical Science)
Trenes En Acción (Trains on the Go) (Bumba Books (R) en Espanol -- Maquinas en Accion (Machines T)
Tractocamiones En Acción (Big Rigs on the Go) (Bumba Books (R) en Espanol -- Maquinas en Accion (Machines T)