Basic GIS coordinates / Jan van Sickle. Van Sickle, Jan. Grids (Cartography) Data processing. Geographic information systems. GA116 .V36 2004 910.285 22 VAB Includes bibliographical references (p. 165) and index. Boca Raton, Fla. : CRC Press, c2004. c2004. 2004 Text 173 p. : http://www.loc.gov/catdir/toc/fy051/2003069761.html eng