As we all know, english speaking textbooks are mostly superior to german textbooks.
In this thread I would like you to recommend your favorite english speaking textbook.
I start with Harrison's Principles of Internal Medicine, maybe the most famous medical textbook of all times It covers every aspect of "medicine" with very detailed information, a must have in your bookshelf
Also avaiable in a German translation, which is much more expensive than the English one.
Other favorites of mine are Guytons Textbook of medical physiology and the Oxford Handbook of Medicine.