Filchner, Wilhelm,  1877-1957. <br/><br/>
Route-mapping and position-locating in unexplored regions, 
by Wilhelm Filchner, Erich Przybyllok [and] Toni Hagen. 
 - New York :  Academic Press :  1957. 
 - 288 p.  il.  25 cm. 
<br/><br/>bibliografía al final del volúmen. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Surveying.<br/>Orientation.
<br/><br/><label>Subjects--Index Terms: </label>agrimensura orientación 
<br/><br/><label>Universal Decimal Class. No.: </label>528.9