The new encyclopaedia britannica,inc :  nowledge in depth. 

 - 15th ed. 
 - USA :  Encyclopaedia Britannica,Inc,  1991. 
 - 1010 p. :  ill. ;  28 cm. 
 -  Vol. 23 .
<br/><br/><label>ISBN: </label>0852295294 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Britannica.
<br/><br/><label>Dewey Class. No.: </label>REF