00924nam0-2200313---450-99000919521040332120100608095331.00119505037000919521FED01000919521(Aleph)000919521FED0100091952120100608d1972----km-y0itay50------baengCHa-------001yyCiliated protozoaan illustrated guide to the species used as biological indicators in freshwater biologyHartmut BickGenevaWorld Health Organization1972198 p.ill.24 cmProtozoiBick,Hartmut508096Organizzazione mondiale della sanitàITUNINARICAUNIMARCBK990009195210403321IG 17 D 101363DMIGIDMIGICiliated protozoa775336UNINA