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    Clues to America’s Past

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    Canada’s Wilderness Lands

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    Discovering Man’s Past in the Americas

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    Drives of a Lifetime: 500 of the World’s Most Spectacular Trips

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    National Geographic Desk Reference

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    Exploring America’s Backcountry

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    Exploring America’s Valleys

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    Exploring Canada From Sea to Sea

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    Eyewitness to History: From Ancient Times to the Modern Era

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    Forgotten Edens

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    Great American Deserts

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    Guide to Scenic Highways & Byways

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    Guide to The Lewis & Clark Trail

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    Gypsies Wanderers of the World

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    George Washington, Spymaster

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    Hidden Alaska: Bristol Bay and Beyond

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    High Country Trail – Along the Continental Divide

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    Hubble: Imagining Space and Time

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    Harriet Tubman, Secret Agent

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    Hidden Worlds of Wildlife

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    Index 1888-1946

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    Index July-December 1931

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    Index January-June 1931

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    Index 1947-1976

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    Index 1977-1981

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