Explaining biological farm and function 
edited by the Open University 
 - Great Britain  The Open University  1981 
 - 32p.:ill.; 
<br/><br/><label>ISBN: </label>0355160433 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biological illustration
<br/><br/><label>LC Class. No.: </label>QH318.E8