SPENCER John Global positioning system A field guide for the social sciences SPENCER John - Oxford Blackwell Publishing 2003 - xii,218p. Bib p. 204-207 Appendix p. 208-213 cm. ISBN: 1405110849 4177.00 Source: 3437, 17/02/2005, Efficent General Book Subjects--Topical Terms: Modern - Geography Dewey Class. No.: U:(D6,9(B), P3