• All
• 1930s2
• 1940s2
• 1950s5
• 1960s6
• 1970s2
• 1980s7
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• 2010s1

• All
• Education 4
• Entertainment / Culture 1
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• Other 8
• Religion / Belief 8

• Ddt 1
• Environmentalism 1
• Greenpeace 1
• James Lovelock 1
• Malaria 1
• Patrick Moore 1

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