Matches in Library of Congress for { ?s ?p A simple explanation of gears and what they do.. }
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- 77007631 abstract "A simple explanation of gears and what they do.".
- 78021312 abstract "A simple explanation of gears and what they do.".
- 78026614 abstract "A simple explanation of gears and what they do.".
- 77007631 description "A simple explanation of gears and what they do.".
- 78021312 description "A simple explanation of gears and what they do.".
- 78026614 description "A simple explanation of gears and what they do.".