Pollard Memorial Library (Lowell)
621.8
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http://bibfra.me/vocab/lite/Category
Label
621.8
Code
621.8
Source
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7
Pulleys pull their weight, Andi Diehn ; illustrated by Micah Rauch
Levers and pulleys., produced by Disney Educational Productions ; series producers, Kathy Kachta, Dan Staedler, Widescreen/Fullscreen
Machines & inventions
Castle under siege!, Andrew Solway
Machines, Fred Wilkin. --
Machines, Wendy Baker & Andrew Haslam ; written by David Glover ; photography by Jon Barnes
Front-end loaders, by Aubrey Zalewski
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