Biology of polluted water  [motion picture] / 
Open University ; consulting engineer, Frank Clough 
 - Milton Keynes :  The Open University Press,  1975 
 - 1 film reel (24 min.) :  sd., b&w. ;  16 mm. + script 
<br/><br/> Examines the use of biotic index, a relatively simple scheme for grading river quality according to river fauna.  Comparas the biotic indexes of polluted and inpolluted stretches of the Tame, which rises on Saddleworth Moor and runs through and industrial area of River Mersey  Backup available in VHS 1/2 in.  Bahan rosak (Lupus) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution--Measurement