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1.
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Chimpanzee Society in the African Rain Forest
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2.
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Death in Grand Canyon
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3.
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High Adventure and Hard Lessons Exploring the...
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4.
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5.
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Death in Grand Canyon
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6.
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7.
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8.
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Death in Yosemite
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9.
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10.
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11.
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Tracing the Origins of Violence
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12.
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Tracing the Origins of Violence
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13.
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Death in Grand Canyon
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