The second book you're thinking of is probably Hulda Clark's, "The Cure for All Cancers." Now, the government doesn't really ban any books, but there's a bunch of reasons this particular one isn't around. There's a whole bunch on her at Quackwatch, too. Here is her main theory, though, let it never be said I won't give someone equal time.
Incidentally, Quackwatch is a great resource altogether for health stuff. I always check them when a customer asks why a diet/health book went out of print.
I also heard there was a medical book that actually had the cure for cancer. Supposedly it was banned in the US. What was it?