Just received this newly released book I ordered. It's Cruisers by Jonny Fuego and Michael Ames. "From classics to customs and every cruiser in between". It's full of great photos and has quite a bit of history.
This is a great one of a kind book, although somewhat of a commercial. It gives a good overview of the fat tire bike world. I found them availabe through Amazon.com.
It even has an example of another craze of adding motor kits to a stock cruizer to make Whizzer type knock-off.