Von Mackensen, Ludolf  <br/><br/>
German natural scientists and inventors over four centuries/ 
Ludolf Von Mackensen 
 - Munich:  Inter nationes bonn,  1991. 
 - 61 p.:  ill., (some col.); 
<br/><br/><label>Subjects--Topical Terms: </label><br/>inventors-German. scientist 
<br/><br/><label>Dewey Class. No.: </label>925