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Como Funcionan Las Poleas/How Pulleys Work
By Jim Mezzanotte
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Book cover for 9780836874440
 
from Weekly Reader Early Learning (August 30, 2006)
9780836874440 | details & prices | 24 pages | 7.25 × 7.25 × 0.25 in. | 0.35 lbs | List price $22.00
About: Demonstrates how pulleys help to do work by transferring force in different directions.