I was highly disappointed with this book. There are some techniques, but I felt it badly build up, and to strongly a mere collection of styles, with some technical comment added. 3 hours on YouTube or just this blog gives more and better defined information.
In short, nice to look at, but not helpful to get started in Urban Sketching, other than having a look at what it is.
I therefore gave it away within a week. Not even bordered to return it.