baseline - Projection of the receipts, outlays, and other budget amounts that would ensue in the future without any change in existing policy. Baseline projections are used to gauge the extent to which proposed legislation, if enacted into law, would alter current spending and revenue levels.
Congressional Sessions lists all Congresses and corresponding years - from 1789, when the 1st Congress met, through the current Congress.
You can access legislative information, by bill number or key words, from the THOMAS Web site. Information from the present back to the 93rd Congress (1973) is available on THOMAS.
For information on the Senate, Congress, the legislative process and the federal government, the Virtual Reference Desk is a good place to begin.