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IUCN action. 世界自然保护联盟行动。
Earthwatch Pub Date : 1984-01-01
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引用次数: 0
Population and natural resources: a statement. 人口与自然资源:一份声明。
Earthwatch Pub Date : 1984-01-01
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引用次数: 0
Land and people, the growing pressure. 土地和人，压力越来越大。
Earthwatch Pub Date : 1983-01-01
P Harrison
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引用次数: 0
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