1. Natural Sciences, Technologies And Engineering | OTHER NATURAL SCIENCES, TECHNOLOGIES AND ENGINEERING NOT ELSEWHERE CLASSIFIED | OTHER NATURAL SCIENCES, TECHNOLOGIES AND ENGINEERIN NOT ELSEWHERE CLASSIFIED
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2. Applied Sciences And Technologies | Resource-Based Technology | Other Resource - Based Technology
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3. Environmental Sciences | Environment Technology / Industry | Water And Wastewater Treatment Technology
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4. Biotechnology | Industrial And Environmental Biotechnology | Bioremediation
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