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1.
What Is a Lever?
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 pages
Date: 2002
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2.
What Is a Screw? / by Lloyd G. Douglas
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 p
Date: 2002
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3.
What Is a Wedge? / by Lloyd G. Douglas
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 p.
Date: 2002
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4.
What Is a Pulley? / Lloyd G. Douglas
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 p.
Date: 2002
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5.
What Is a Plane?
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 pg.,
illus.
Date: 2002
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6.
What Is a Wheel and Axle? / by Lloyd G. Douglas
by Douglas, Lloyd G.
Publication:
New York Children's Press 2002
. 24 pg.,
Date: 2002
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