Did you try contacting the author(s) of the papers? In my experience, most authors are happy to hear about uses of their work (even if they are in a...
There are lots of tools out there that can do hillshading on available DEMs. QGIS is one option. A reasonable dataset for maps of the US is ETOPO2.
...
Saving for CS4!, Corel Painter X, Fractal Terrains, Wilbur, Anything and Everything Else!
Signature
Dollhouse Syndrome = The temptation to turn a map into a picture, obscuring the goal of the image with the appeal of cute, or simply available, parts. Maps have clarity through simplification.