Helen Frost

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espressologist (Frances Foster Books)

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Your Teeth (Dental Health)

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What are pulleys?

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What Are Wheels and Axles? (Looking at Simple Machi …

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What Are Wedges? (Pebble Books)

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What Are Screws? (Looking at Simple Machines)

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What Are Levers? (Looking at Simple Machines)

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What Are Inclined Planes? (Pebble Books)

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Wasps (Pebble Books)

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