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SIMPLE MACHINES    SERIES OF 2 BOOKS    
SCREWS 2011 - LOOK INSIDE - REVIEWS   BY VALERIE BODDEN
ISBN 978-1-60818-011-0      $20.95      24 PAGES      NEXT BOOK
A foundational look at screws, explaining how these simple machines work and describing some common examples, such as jar lids, that have been used throughout history.

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