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1
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2
Trends in research and in the application of science and technology for arid zone development.
Gepubliceerd in 1979Boek -
3
Management of natural resources in Africa traditional strategies and modern decision-making.
Gepubliceerd in 1978Boek -
4
Human population problems in the biosphere some research strategies and designs
Gepubliceerd in 1977Boek -
5
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6
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7


