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Nature protection --- Biomathematics. Biometry. Biostatistics --- General ecology and biosociology --- 574 --- 502.65 --- #ABIB:aeco --- #WPLT:dd.Prof.F.Symons --- General ecology. Biocoenology. Hydrobiology. Biogeography --- Conservation of exploitable natural resources. Soil conservation, recultivation, improvement. Water conservation. Mineral resources --- Animal populations. --- Ecology. --- Environmental Sciences and Forestry. Ecology --- Ecology (General) --- Ecology (General). --- 502.65 Conservation of exploitable natural resources. Soil conservation, recultivation, improvement. Water conservation. Mineral resources --- 574 General ecology. Biocoenology. Hydrobiology. Biogeography