Sands, Margaret Kathleen. <br/><br/>
Problems in ecology / 
M. K. Sands. 
 - Teachers' ed. 
 - London :  Mills and Boon,  1978. 
 - 135 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0263063755 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Study and teaching.
<br/><br/><label>Dewey Class. No.: </label>577.071  / SAP 1978