Good idea muttgirl....I was wondering the same thing....
Have you tried looking for electronic versions of old books? A couple of texts are lurking around on peoples homepages, especially if they're devoted to natural medicine. You could also try these 'eLibraries' or that sort of thing, but I doubt that they'd store such materials.
Finally, there might be some sites that are devoted to making old books electronic...like the Gutenberg Project. While this site itself might not be focusing on medical books, I'm sure there must be others that might have a few medical books included.