Homework Heaven is a huge online academic research directory, with over 12,000 hand picked links and 70 special school subject search engines. It's designed exclusively for students from K-12 through College level. The links provide access to specific information and research sources covering hundreds of school subjects.
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Here a new standard resource has been created for American history, political science, law, and economics. The Government Printing Office describes this as a core group of current and historical Government publications. Of course the Declaration of Independence and Constitution are here, but so are Congressional bills and the Congressional Record, Public Laws, the United States Code, Supreme Court Decisions since 1937, the Code of Federal Regulations, the Federal Register, the Budget of the United States Government, many Presidential documents, the Statistical Abstract of the United States, and economic reports. Found here is the Congressional Directory, whose updated annual publication was Once eagerly awaited. There are materials here for younger students, but they are imbedded in analysis of icy Arctic science sufficient for the most sophisticated scholar.