Ewer, D. W. <br/><br/>
Ecological biology  Teacher's guide 1 / 
D.W. Ewer, J.B. Hall, June Mitchelmore 
 - Harlow :  Longman,  1975 
 - viii, 445p. :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology