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Kajak,Z.: and A.Hillbricht-Ilkowska (eds.):Productivity problems of freshwaters.1972.(Proceed.IBP.-UNESCO Symposium on Prouctivity Problems of Freshwaters held in Kazimierz Dolny,Poland,May 6-12,1970).Numerous figs.tabs.918 p. gr8vo.Paper bd.(5768) 32.10
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