Earth matters; environmental challenges for the 1980s
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Format: | Texto biblioteca |
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Nairobi (Kenya) UNEP
1983
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Subjects: | ENVIRONMENT, POLLUTION, ENVIRONMENTAL PROTECTION, NATURE CONSERVATION, ENVIRONNEMENT, MEDIO AMBIENTE, PROTECTION DE L'ENVIRONNEMENT, CONSERVATION DE LA NATURE, POLUCION, PROTECCION AMBIENTAL, CONSERVACION DE LA NATURALEZA, |
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