First Step Nonfiction: Simple Machines to the Rescue
Serie di Libri
di Mari Schuh
Ultimo:
2015
Making a Salad: Wedge vs. Inclined Plane
di Mari Schuh
Hauling a Pumpkin: Wheels and Axles vs. Lever
di Mari Schuh
Going Ice Fishing: Lever vs. Screw
di Mari Schuh