Slopes (Simple Technology)
by Mike Gordon, Caroline Rush
ISBN 13: 9780750218658
Format: Hardcover (32 pages) Publisher: Hodder Wayland Published: 31 Jul 1996
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Levers (Simple Technology)
by Mandy Suhr, Mike Gordon
ISBN 13: 9780750218351
Format: Hardcover (32 pages) Publisher: Wayland Published: 30 Apr 1996
Wheels and Cogs (Simple Technology)
ISBN 13: 9780750218344