(26 Sep 1991)
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Includes delivery to the United States
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Explains what gears are used for and why some gears work better than others. There is a blueprint at the end of the book to build a model helicopter. This book is part of a series which uses toys to educate children about science.
| ISBN: | 9780713633542 |
| Publisher: | A & C Black |
| Imprint: | A & C Black |
| Pub date: | 26 Sep 1991 |
| DEWEY: | 621.811 |
| DEWEY edition: | 20 |
| Language: | English |
| Number of pages: | 32 |
| Weight: | 307g |
| Height: | 232mm |
| Width: | 218mm |
$0.57off
Paperback
Published 31 Aug 2018
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