Cartography : thematic map design / Borden D. Dent, Jeffrey S. Torguson, Thomas W. Hodler. Dent, Borden D. Torguson, Jeffrey. Hodler, T. W. Cartography. Thematic maps. GA105.3 .D45 2009 526 22 DEC Includes bibliographical references and index. New York : McGraw-Hill Higher Education, c2009. c2009. 2009 Text xvi, 336 p., 16 p. of plates : http://www.loc.gov/catdir/toc/ecip0820/2008025397.html eng