Richard A. Becker, and Allan R. Wilks,
"Maps in S",
AT&T Bell Laboratories Statistics Research Report [93.2], 1993.Richard A. Becker, and Allan R. Wilks,
"Constructing a Geographical Database",
AT&T Bell Laboratories Statistics Research Report [95.2], 1995.
CartoDraw,
http://infovis.uni-konstanz.de/~panse/CartoDraw/CartoDrawIndex.php