R. J. Lefkowitz
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Forces in the Earth: A Book About Gravity and Magnetism
Lefkowitz, R. J.
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Save It! Keep It! Use It Again!: A Book About Conservation and Recycling (Finding-out Book)
Lefkowitz, R. J.; Johnson, John Emil
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Push! Pull! Stop! Go! a Book About Forces and Motion, (Finding-Out Books)
Lefkowitz, R. J.
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Water for Today and Tomorrow (A Stepping-Stone Book)
R. J. Lefkowitz.
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Electronics for Young People
Bendick, Jeanne
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