Children's Britannica. 

 - 3rd ed. 
 - London :  Encyclopaedia Britannica,  © 1973. 
 - Vols. :  ill. ;  25 cm. 
<br/><br/>V. 18 - Tracks - walls and fences ;  
<br/><br/>314  314 
<br/><br/><label>ISBN: </label>0 85229 099 3 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Children's encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>032 / C436