Books on poker odds and probability

As of now i just play poker and go with my instinc=t and do pretty well but would also like to learn how to read more into the odds of hands and the probability. So if anyone knows any good books on the subject i would highly appreciate the input.

thanks will check it out

Also, another great series of poker books is the Harrington series. There is about 3 books for tourneys, and a couple others for cash games. I haven't read the cash games, but I have all the tourneys. These books does a great job breaking everything down, as well as give plenty of examples. Start with Vol 1, and they flow into the next pretty well.

There are two books I recommend; "Roy Rounder Poker math made easy" and The Mathematics Of gambling (Edward O. Thorpe)