Help Me

I will be starting my final semester of college in a little less than 2 weeks. Being a geography major, I had to choose a senior thesis topic relevant to that and my professor actually suggested I do it on beer.  My actual topic, as of now, is How microbreweries came about in America and how they began to spread geographically over the country. I have already begun researching, but my question is if anyone that reads this knows of any good books or articles I could use, please let me know. I will appreciate it greatly, and I'll even buy you a beer if we ever run into each other!