Williams, John          <br/><br/>
Projects with Machines 
John Williams; illustrated by Malcolm S. Walker 
 - Rev. ed. of : Machines. 1990 
 - Milwaukee  Gareth Stevens Children's books  1990 
 - 32 p. 
 - Simple science projects . <br/><br/> Includes bibliographical references and index. 
<br/><br/> Provides instructions for making and using a variety of machines, including levers, differs, cranes, and pulleys. 
<br/><br/> 7 - 9 years 
<br/><br/><label>ISBN: </label>0836807693 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machinery--experiments
<br/><br/><label>Dewey Class. No.: </label>j621.8078 Wil   26