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Author: Lloyd G. Douglas [ All ]

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  Title Copies
What Is a Plane? (Welcome Books: Simple Machines) 
Year: 2002 
ISBN: 0516240234 
ISBN 13: 9780516240237 
What Is a Pulley? (Welcome Books: Simple Machines) 
Year: 2002 
ISBN: 0516240242 
ISBN 13: 9780516240244 
What Is a Screw? (Welcome Books: Simple Machines) 
Year: 2002 
ISBN: 0516240250 
ISBN 13: 9780516240251 
What Is a Wedge? (Welcome Books: Simple Machines) 
Year: 2002 
ISBN: 0516240269 
ISBN 13: 9780516240268 
What Is a Wheel and Axle? (Welcome Books: Simple Machines) 
Year: 2002 
ISBN: 0516240277 
ISBN 13: 9780516240275