Children's Britannica :  Nitrogen to Philistines / 

 - Auckland :  Encyclopaedia Britannica,  1991. 
 - 320 p.  ill.  24 cm. 
<br/><br/><label>ISBN: </label>0852292295 
<br/><br/><label>Subjects--Topical Terms: </label><br/>General Encyclopeadias in English Language
<br/><br/><label>Dewey Class. No.: </label>032  / CHI