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Page 45
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The Secret of the Universe. 1991.
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Asimov's Guide to Earth and Space. 1991.
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Faeries (editor; with Martin H. Greenberg and Charles G. Waugh). 1991. The March of the Millennia: A Key to Looking at History (with Frank White). 1991.
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What Is an Eclipse? 1991.
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Why Do We Have Different Seasons? 1991.
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What Is a Shooting Star? 1991.
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Why Do Stars Twinkle? 1991.
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Christopher Columbus: Navigator to the New World. 1991.
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Why Does the Moon Change Shape? 1991.
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Henry Hudson: Arctic Explorer and North American Adventurer (with Elizabeth Kaplan). 1991.
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Our Angry Earth (with Frederik Pohl). 1991.
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Asimov's Chronology of the World. 1991.
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Atom: Journey across the Subatomic Cosmos. 1991.
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Child of Time (with Robert Silverberg). 1991.
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The Positronic Man (with Robert Silverberg). 1992.
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The Mammoth Book of Fantastic Science Fiction (editor; with Charles G. Waugh and Martin H. Greenberg). 1992.
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Asimov Laughs Again: More Than 700 Favorite Jokes, Limericks and Anecdotes. 1992.
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The Ugly Little Boy (with Robert Silverberg). 1992.
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Why Does Litter Cause Problems? 1992.
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Why Are Whales Vanishing? 1992.
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Why Are the Rain Forests Vanishing? 1992.
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Why Are Some Beaches Oily? 1992.
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What's Happening to the Ozone Layer? 1992.
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Why Are Animals Endangered? 1992.
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Where Does Garbage Go? 1992.
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Why Is the Air Dirty? 1992.
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What Causes Acid Rain? 1992.
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Is Our Planet Warming Up? 1992.
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The Mammoth Book of Modern Science Fiction (editor; with Martin H. Greenberg and Charles G. Waugh). 1993.
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Forward the Foundation. 1993.
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Why Do People Come in Different Colors? (with Carrie Dierks). 1993.
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Why Do Some People Wear Glasses? (with Carrie Dierks). 1993.

 
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