Ecological biology  practical book / 
by D. W. Ewer, J.B. Hall, June Mitchelmore 
 - Harlow, Essex :  Longman,  1975 
 - 2 v. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0582606462 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Laboratory manuals<br/>Biology--Laboratory manuals