Wachtel, Hellmuth <br/><br/>
Aquarium ecology /  
Hellmuth Wachtel 
 - U.S.A  1969 
 - 128 p.  il. color.:20 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecologia
<br/><br/><label>Dewey Class. No.: </label>597