RAO, K.S. <br/><br/>
FRESHWATER ECOLOGY ( BRYOZOA ) 

 - New Delhi  Anmol Publications Pvt. Ltd., New Delhi   1992 
<br/><br/><label>ISBN: </label>81 7041 627 2 
<br/><br/><label>Dewey Class. No.: </label>594.67  / RAO/F