Inside Ralphie  
A book about Germs 
ISBN 0590400258 Scholastic Paperback WB Price: $8.50
Ralphie falls sick. The Magic School Bus goes inside Ralphie’s body to see how germs make him sick and how they are destroyed.

Magic School Gets Eaten A book about Food Chains 
ISBN 0590484141 Scholastic Paperback WB Price: $6.45
The Magic School Bus dives into the ocean to learn how and where the food chain begins and ends.

The Magic School Bus Blows It's Top
ISBN 0590508350 Scholastic Paperback WB Price: $6.45
Once again, Ms. Frizzle gets her class right in the "thick" of things--this time, they're right in the thick ooze of an underwater volcano's magma chamber! As Arnold and Carlos watch from a raft above, the Magic School Bus "erupts" with the magma and lava, and lands atop a brand-new island! 

The Magic School Bus Sees Stars A book about Stars 
ISBN 0590187325 Scholastic Paperback 
WB Price: $6.45
Ms. Frizzle’s class learns how stars are formed and other starry facts like the age of stars and how far they are from Earth.