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How much blood is in the human body? What purpose does the heart serve? Showers delivers a simple, entertaining introduction to blood and its function.

A Drop of Blood 2004, HarperCollins, New York, NY

ISBN-13: 9780060091101

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A Drop of Blood 2004, HarperCollins Publishers, New York, NY

ISBN-13: 9780060091088

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A Drop of Blood 2004, HarperCollins Publishers

ISBN-13: 9780060091095

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A Drop of Blood 2004, Perfection Learning

ISBN-13: 9780812458190

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A Drop of Blood 1992, Random House Value Publishing

ISBN-13: 9780517085059

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A Drop of Blood 1989, HarperCollins Publishers

ISBN-13: 9780064450904

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A Drop of Blood 1989, Crowell, New York, NY

ISBN-13: 9780690047158

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A Drop of Blood 1989, Crowell, New York, NY

ISBN-13: 9780690047172

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Drop of Blood 1985, HarperCollins Publishers

ISBN-13: 9780064450300

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Drop of Blood 1968, A & C Black Publishers Ltd, London

ISBN-13: 9780713609271

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A Drop of Blood 1967, Turtleback Books

ISBN-13: 9780606020831

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