The U.S. government can be a rich source of information if you know where to look; here's some places to get started.
A collection of links to the home pages of non-governmental organizations, think tanks, societies, etc.
PORTALS are collections of links to web sites on a specific subject. They can be a useful way to find Internet information BUT, be aware that some portals, especially those created by businesses, include more commercial web sites than links to scholarly information. Always doublecheck an Internet site for accuracy and currency. Who wrote it? What is its purpose?
There are many additional resources and guide hosted by the state university of New Jersey. These are just a few.