I wish the second review had been posted before I bought this book! I was expecting a much more "manual" type book, with reference listings of various clues based on costume, photo type, etc. This book is written as a history, more or less, and you really have to page all through it to look for the information you need. There are no charts summarizing information whatsoever.
As noted, it has a UK point of view, and although this often doesn't make a difference, sometimes it does. For example, one paragraph talks about the advent of photo postcards and how you can date them depending on what the postal code required to be printed on them. However, this would be UK postal code, not US, so for my purposes useless.
One very aggravating aspect: although there are many, many photos throughout the book (at least one per page) they are not captioned with the date taken, but only referenced in the text, and often on a completely different page than the photo. I'm tempted to go through and note the dates on each photo, but I'm annoyed that I should have to do so. It seems a simple and obvious thing to omit, considering most readers are likely trying to date photos and would appreciate viewing the huge photo collection to link photo clues with date taken. They are printed in no chronological order either, so you can't even assume a photo placed later in the book was made after one that is placed earlier.