Relates several episodes in the friendship of two hippopotamuses.

George and Martha 2010, Turtleback Books

ISBN-13: 9780606150910

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George and Martha 2007, Houghton Mifflin, New York, NY

ISBN-13: 9780618839513

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George and Martha 2007, Houghton Mifflin, Boston, MA

ISBN-13: 9780618963317

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George and Martha 1974, Hmh Books for Young Readers, Boston, MA

ISBN-13: 9780395199725

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George and Martha 1974, Turtleback Books

ISBN-13: 9780881038057

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George and Martha 1974, Perfection Learning, Boston, MA

ISBN-13: 9780812433821

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George and Martha 1974, Turtleback Books

ISBN-13: 9780606033947

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George and Martha 1972, Hmh Books for Young Readers, Boston, MA

ISBN-13: 9780395166192

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George and Martha 1972, Houghton Mifflin, Boston, MA

ISBN-13: 9780395137314

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George and Martha 1972, Houghton Mifflin

ISBN-13: 9780395137321

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