There is a fantastic reference guide to all 50 states gun laws for $15 at mylegalheat.com. It also contains many other great bits of information such as airports, traveling, shipping, stopping power, etc. all written from the perspective of gun rights attorneys. They address the question of "should you inform the leo that you are armed when not required to?" from a legal stand point you've probably never heard. I highly recommend this book, and they also have a phone app that contains almost all the book info for only $0.99. They also stay updated unlike some. Well worth the $