Water quality. Biological methods. Methods of biological sampling: guidance on the design and use of quantitative samplers for benthic macro-invertebrates on stony substrata in shallow freshwater— 20 стр.
Water quality. Biological classification of rivers. Guidance on the interpretation of biological quality data from surveys of benthic macroinvertebrates— 16 стр.
Water quality. Biological classification of rivers. Guidance on the presentation of biological quality data from surveys of benthic macroinvertebrates— 16 стр.