I searched for a year to find this book used and still paid a lot for it. Yes, it was worth it. The information and photographs detail the research the author has done to write this book. Some of the terminology looses me because so many French words are used as names for different parts in a fort and I can't remember them. There is a lot of depth to this book and I have thoroughly enjoyed reading it. I would love to see this book got back into print. For someone interested in how and why the third system forts were built, this book is an essential read. For a Civil War buff this book also talks about the strategy used in defending and defeating the forts. If you want to get a copy of this book just keep searching and eventually you will find it.