Some of the reviews of this book surprise me. I have seen similar negative comments written about these authors on separate web sites, and no doubt the comments here are by the same people. My experience with this book is this....the main appeal to this book is that there are literally hundreds and hundreds of patterns identified, and by using the photos in this book, I've been able to identify pieces in my collection that I previously could not. Certainly I wish there was more information and detail written about each pattern...this book lists maybe a line or two about each pattern only, with no to few comments about reproductions. So, I use this book in conjunction with other pattern glass books (Reilly and Jenks, Warman's, etc) to get the most comprehensive picture I can. Some of the pictures are not super clear. Compared to other books which don't list many patterns at all and then do so in black and white or hand drawing, I'll live with it. I would imagine photographing the detail on clear glass isn't easy! I guess I'll summarize by saying that while the book is not perfect, it certainly takes a good stab at trying to organize information and photos of hundreds of pieces of glass from the turn of the century. Are there errors? Probably! But with all the fires in these glass companies over the years I am sure no one has the truth about everything.