FERGUSON, MICHAEL GPS LAND NAVIGATION: A COMPLETE GUIDEBOOK FOR BACKCOUNTRY USERS OF THE NAVSTAR SATELLITE SYSTEM - S.E. - BOISE Estados Unidos GLASSFORD 1997 - 255 ISBN: 0965220257 LCCN: 87255 Subjects--Topical Terms: ORIENTACIONSISTEMA DE POSICIONAMIENTO GLOBAL Dewey Class. No.: 629.045