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Pumpus and his friends plan on spending the night in their treehouse. But when they realize they forgot the batteries for the flashlight, Pumpus uses his book of great inventions to solve their problem using a dynamo and waterwheel to make electricity. Through science, mechanics, and safety, Pumpus saves the day!
- Illustratör: Jack Spellman
- Format: Inbunden
- ISBN: 9780997480931
- Språk: Engelska
- Antal sidor: 34
- Utgivningsdatum: 2017-01-01
- Förlag: Boon-Dah LLC