Billerica Public Library
620
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http://bibfra.me/vocab/lite/Category
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620
Code
620
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ddc
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Engineering, created by Basher ; written by Jonathan O'Callaghan
How technology works, the facts visually explained, contributors, Jack Challoner [and 6 others]
The engine room, solve your way out! : use your engineering skills to escape!, Alix Wood
Think like an engineer, Robin Koontz
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