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- America - Discovery and exploration - Economic aspects
- America - Discovery and exploration - Environmental aspects
- Borlaug, Norman E. (Norman Ernest), 1914-2009
- Climatic changes
- Columbus, Christopher - Influence
- D
- Energy security
- Environmental sciences - History - 20th century
- Environmentalists - United States - Biography
- Europe - History - 1492-1648
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- Vogt, William, 1902-1968
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