How to track a law from the bill stage though passage into law.
GAO = Government Accountability Office
CRS = Congressional Research Service
CBO = Congressional Budget Office
Congressional Record is the proceedings of the United States Congress. There were several preceeding titles: The Debates and Proceedings in the Congress of the United States [1789-1824]; Register of Debates in Congress [1824-1837]; and The Congressional Globe [1833-1873]. Also online are the Journals of the Continental Congress, 1774-1789.
Congressional Reports eventually become part of the U.S. Congressional Serial Set. Congressional Reports, consisting of Senate and House Reports, are important for several reasons: 1) they often present the legislative intent of congressional bills (why was this law needed?; what were the legislators thinking?; and 2) they often present statistics and other useful background information.