Machines
by Anne F. Rockwell, Harlow Rockwell · 1972
Briefly describes simple machines, machine parts, and the powers that move them.
MachineryJuvenile literatureMachinery, juvenile literatureMachinesOuvrages pour la jeunesse
by Anne F. Rockwell, Harlow Rockwell · 1972
Briefly describes simple machines, machine parts, and the powers that move them.