Photography books are expensive, really expensive. I've collected dozens and dozens over the years and I kind of feel as though I have tied up a lot of money in books. It's not a bad thing, but I do wonder about the end result. Will I ever recoup my investment? Maybe. Certainly those who snapped up a first edition of "The Decisive Moment" are in luck. But it's always a gamble and always expensive.
Explore Flickr by Thomas Leuthard - a great ebook loaded with both photographs and information about Flickr. Leuthard is a notable figure on the street photography scene and he has produced some great ebooks - all of which are free!