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2Ecological Indicators for the Assessment of the Quality of Air, Water, Soil, and Ecosystems [electronic resource] : Papers presented at a Symposium held in Utrecht, October 1982 / Ecological Indicators for the Assessment of the Quality of Air, Water, Soil, and Ecosystems [electronic resource] : Papers presented at a Symposium held in Utrecht, October 1982 /Texto bibliotecaCOLPOS
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3Ecological Indicators for the Assessment of the Quality of Air, Water, Soil, and Ecosystems [electronic resource] : Papers presented at a Symposium held in Utrecht, October 1982 / Ecological Indicators for the Assessment of the Quality of Air, Water, Soil, and Ecosystems [electronic resource] : Papers presented at a Symposium held in Utrecht, October 1982 /Texto bibliotecaCOLPOS