Bob Emmons has done his homework. He is painstakingly accurate. His tequila facts read a bit like a textbook and his stories, one from almost every distillery, read like prose. You cannot ask for. He lets the reader know what an NOM number is and what it means. He shows which distilleries make only one unique brand and which make dozens of brands using the same tequila in all brands If you are serious about tequila, this book is a must.