The Complete Book of Incense Oils and Brews by Scott Cunningham
I feel like I shouldn't even have to describe this book. This is one of those books that pretty much everyone should have on their shelf. It's full of recipes, information, lore and is a valuable resource for anyone who works with herbs and oils. If you don't have this book, you need it. If you have it and your copy is falling apart because of the massive use it has endured here's a chance to get another copy at a great price.
The book is in great shape but does have some page yellowing