Plum, Werner. <br/><br/>
German Trade Promotion in the First Half of the Nineteenth Century / 
Plum, Werner. 
 - Bonn-Bad, Godesberg :  Friedrich-Ebert-Stiftung ;  1974. 
 - 155 p. ; 
<br/><br/><label>Dewey Class. No.: </label>P16  / P730