Young scientist /  
Edited by Childcraft ; Illustrated by Martin Aitchison ... [et. al.]. 
 - Chicago :  World Book International,    © 1994. 
 - Vols. :  ill. ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/>V. 14- Looking at structures ;  
<br/><br/>314  314 
<br/><br/><label>ISBN: </label>0-7166-6303-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science.<br/>Architecture, Medieval --Security systems.
<br/><br/><label>Dewey Class. No.: </label>500 / W893y