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Environmental protection. Environmental technology --- 614.7 --- 502.3 --- 502.5 --- 574 --- Pollutie van lucht, water, grond--(openbare gezondheidszorg) --- Nature and society. Nature conservation and protection in general --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- 502.3 Nature and society. Nature conservation and protection in general