Very helpful and I'd recommend it to anyone, but there is one annoyance with this book--the code "PNWPL". If that's the code listed, it means that they weren't able to find a current nursery carrying that particular plant, but that it was listed in a previous edition of "The Plant Locator." In order to find out which nursery carried it in the past (and may have it now, just not listing it in a catalog), you'll have to obtain both earlier editions of the book. Having to keep 3 editions of the book around in order to possibly find a plant is a bit much. Maybe an asterisk on the appropriate nursery code to show they carried it once but aren't listing it now? It just seems there has to be an easier way. Other than that, a wonderful resource!
I find this book very handy when I'm on one of my inevitable, interminable plant hunts. I always want obscure species and varieties, and this book is a great help in finding them. Even with this book and the World Wide Web, sometimes it takes me 3 to 5 years just to FIND a source for my latest horticultural obsession.
Don't know how I lived without this book. If your local nurseries don't cary much, and/or aren't too helpful about finding stuff they haven't heard of, you can find extensive lists of which western nurseries carry what. Mostly organized by genus and species (and varieties). This is not a book you "read" unless you're truly obsessed. But it's incredibly useful.