1.
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Boston : Houghton Mifflin, 1984.
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2.
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Boston : Houghton Mifflin, 1991.
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3.
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Boston : Houghton Mifflin, c1986.
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4.
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Boston : Houghton Mifflin Co., 1981.
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5.
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Boston : Houghton Mifflin Books for Children, c2011.
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6.
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New York : Scholastic, Inc., 1997, c1988.
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7.
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Boston : Houghton Mifflin, 1992.
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8.
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Boston : Houghton Mifflin, 1985.
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9.
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Boston : Houghton Mifflin, 1979.
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