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1. 
Cover image for Biofuel energy / Elsie Olson.
2. 
Cover image for Water energy / Elsie Olson.
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Cover image for Coal energy / Elsie Olson.
4. 
Cover image for Natural gas energy / Elsie Olson.
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Cover image for Oil energy / Elsie Olson.
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Cover image for Geothermal energy / Elsie Olson.
8. 
Cover image for Are you psychic? : facts, trivia, and quizzes / Elsie Olson.
9. 
Cover image for Super gross creepy-crawly projects / Elsi Olson, consulting editor, Diane Craig, M.A./Reading Specialist.