The Merck Manual of Diagnosis and Therapy 1992, 16th Edition

This is serious stuff. The most widely used medical text in the world and the hypochondriac's bible, the Merck has the lowdown on the vast expanse of human diseases, disorders and injuries, as well as their symptoms and recommended therapy. It's intended for physicians and medical students, but though the type is tiny and the language technical, the Merck's a valuable volume for anyone with more than a passing interest in bodily ills.