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Greg gets a microscope and has a fascinating time looking at sugar and salt crystals, thread, hairs, and cells.

Greg's Microscope 1990, HarperCollins, New York, NY

ISBN-13: 9780064441445

Trade paperback

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Greg's Microscope 1990, Turtleback Books, New York, NY

ISBN-13: 9780833568038

Turtleback School & Library edition

Hardcover

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Greg's Microscope 1964, Mammoth, London

ISBN-13: 9780437900319

Paperback

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Greg's Microscope 1963, HarperCollins Publishers

ISBN-13: 9780060252960

Hardcover

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