Gibbons, Gail <br/><br/>
Locks & Keys / 
Gail Gibbons. 
 - New York :  Thomas Y. Crowell,  1980. 
<br/><br/> Traces the history of locks and keys from ancient times to the present, describing the development of increasingly complex and pick-proof locks and how they work. 
<br/><br/><label>ISBN: </label>069004058X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>locks and keys-juvenile literature