Gerard Helferich
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by Gerard Helferich
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The thrilling story of the charismatic explorer who Simon Bolivar called the true discoverer of South America and the daring expedition that altered the course of science....
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by Gerard Helferich
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This dirt-under-the-fingernails portrait of a small-time farmer follows Zack Killebrew over a single year as he struggles to defend his cotton against weeds, insects, and drought....
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