This informative and richly illustrated little book reminds me of the Eyewitness book series I used to buy for my kid. It's organized into bite-sized two page sections that are more or less chronological with a full timeline that runs across the top of each page. There's also a glossary at the end.
My only beef is just how tiny the print is! I found it a challenge to read with my aging eyes. Otherwise, very much recommended introduction to the history of photography and a good outline of some of the key photographers from the earliest pioneers to the artists who change the way we see things.