Wratten, Stephen D. <br/><br/>
Field and laboratory exercises in ecology / 
Stephen D. Wratten, Gary L.A. Fry 
 - London :  E. Arnold,  1980 
 - 227 p. ;  23cm 
<br/><br/>Bibliography: p.213-220 
<br/><br/><label>ISBN: </label>0713127252 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Problems, exercises, etc.<br/>Ecology--Problems