Methods of study in soil ecology:  
/ Unesco, proceedings of the Paris symposium organized by Unesco and the international biological programme  
 - Paris:   Unesco,   1970 
 - 303p.  
 - Ecology and conservation  .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science 
<br/><br/><label>Subjects--Index Terms: </label>Soil ecology