Visualising data by cleveland

["Jonathan Dakin" <jdakin@overwey.demon.co.uk>]

Could anyone comment on the relative merits of two of Cleveland's books: "Elements of Graphing Data" (94), and "Visualising Data"  (93) ?

I'm looking for fairly basic account of the principles of graphical exploration, with particular reference to Splus, which is not too heavy on statistical theory.  My interest is medical data.  If the scripts and datasets used in either are publicly available that would be a big plus.

Many thanks
Jonathan Dakin