Wells, William D. <br/><br/>
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 - 7th ed. 
 - [S.l.] :  Prentice Hall,  2006 
<br/><br/><label>ISBN: </label>0131465600 (hardcover) | 9788131714140 (hardcover) 
<br/><br/><label>Dewey Class. No.: </label>659.1 WEL