Where can I find information about Virginia economy/taxes?

The sources need to be reliable and legitimate because this is for a school project. I need information on the oil economy, specifically with Northern Virginia and taxes. I'm having a hard time finding good sources of information through google, yahoo, etc. search engines... Any help would be AWESOME!|||Try a government website for the state. Most of them provide good overviews of economies and provide links to other sites with more information.