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Freshwater ecology --- Field work --- Problems, exercises, etc --- 574.08 --- 574.5 --- Ecological techniques. Experimental methods. Equipment --- Hydrobiology. Aquatic biocoenoses and ecosystems. Food chains --- 574.5 Hydrobiology. Aquatic biocoenoses and ecosystems. Food chains --- Fresh water --- Fresh-water ecology --- Aquatic ecology --- Fieldwork --- Ecology --- Freshwater ecology - Great Britain - Field work --- Freshwater ecology - Great Britain - Problems, exercises, etc --- Freshwater ecology - Field work --- Freshwater ecology - Problems, exercises, etc