Well, if you're looking at this book, you probably know who Helen Levitt is and you can probably imagine the amazing photographs that are in this book.
Helen Levitt was one of the pioneers of street photography, a self taught photographer who eventually began working with Cartier-Bresson, another pioneer of street photography. Mind you, these two photographers represented REAL street photography, not the (pardon my language) crap we see today from the college kids running around with their $6,000 Leica that Mommy or Daddy bought them. Street photography, unfortunately, has become WAYYYYYYYY overdone and destroyed by people with no true "eye" for it. Now we just see photo after photo of homeless people, stray animals, homeless people with stray animals, etc. etc.
Anyway, sorry to get off topic a bit there. My point is, BUY THIS BOOK. This is REAL street photography where talent and hard work are demonstrated through these beautiful prints. And if you truly want to learn what real street photography is all about, this book is a great starting point.