LEO S. R. <br/><br/>
Ecology and field biology 

 - 3rd 
 - new york  library of congress  1980 
 - xii,835p  hbk 
<br/><br/><label>ISBN: </label>0060463295 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECOLOGY --biology - field work