La Fortaleza de la Calle Cuatro: Una Historia Acerca de Seis Máquinas Simples (Fort on Fourth Street, The: A Story about the Six Simple Machines) by Lois Spangler

La Fortaleza de la Calle Cuatro: Una Historia Acerca de Seis Máquinas Simples (Fort on Fourth Street, The: A Story about the Six Simple Machines)

Lois Spangler with Christina Wald (Illustrator)

32 pages missing pub info (editions)

nonfiction science adventurous medium-paced

Description

Cuando un ni o decide construir una fortaleza en el patio posterior, el abuelo viene a ayudarle. Pero no pueden hacerlo solos -- reciben la ayuda de las seis m quinas simples: la palanca, la polea, el plano inclinado, la rueda y eje, el tornillo, ...

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