The books we used:
How to Catapult a Castle by James De Winter.
Move It! Work It!: A Song About Simple Machines by Laura Purdie Salas.
Heavy Equipment: Cranes by David and Patricia Armentrout. (No pic available).
Simple Devices: The Pulley by Patricia Armentrout. (No pic available.)
Our pulley pulled up many things. One of my children's favorite simple machine so far. Go figure.
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