Homeopathy and where it began
Any serious student of homeopathy needs this book in their library. Everything else is based on it. If you're someone who wants and needs the big picture, this is where it begins.
The original Organon was written in German in the 1830s. This particular English translation, while still stilted and difficult to follow, is readable and understandable.
I have an entire library on homeopathy now. Every single resource quotes or refers to this original work by Dr. Samuel Hahnemann. Having this edition, so lovingly translated by Wenda Brewster O'Reilly, is an essential for me! A keeper to refer to again and again as my study, knowledge and personal practice of this art grows and evolves.