Help! I am really interested in learning the history of traditional yoga....

I am wanting to educate myself on the history and practices of traditional yoga - I am not just interested in learning the postures. There is SO much information out there I would love recommendations on books, websites, organizations that can help get me started. I have no background in yoga, other than a few posture classes.

I am not currently interested in classes (I am shipping out for the National Guard for 6 months) just wanting a way to educate myself and learn some of the history to see if it is something I would like to persue in the future.

Thanks!