Ralph Hempel

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2 books

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Extreme MindstormsDave Baum, Michael Gasperi et al.
Extreme Mindstorms
Dave Baum, Michael Gasperi, Ralph Hempel · 2000 · 347 pages
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LEGO Spybotics Secret Agent Training ManualRalph Hempel
LEGO Spybotics Secret Agent Training Manual
Ralph Hempel · 2002 · 224 pages
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