Bernard S. Cayne, editor in chief <br/><br/>
The Encyclopedia Americana. International edition 

 - N.Y.,  Americana Corporation  c1829, c1974 
 - 800 p  ill.,  30v.: maps, tables, diagrans ;  26 x 19cm 
 - Orley to Photografic telescope-- / volume 21 .
<br/><br/> Includes bibliographical references 
<br/><br/><label>ISBN: </label>0717201058 9780717201051 
<br/><br/><label>LCCN: </label>1764 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Encyclopedias and dictionaries  anglais<br/> États-Unis.
<br/><br/><label>Dewey Class. No.: </label>R 031/E56