presidential signature - A proposed law passed by Congress must be presented to the president, who then has 10 days to approve or disapprove it. The president signs bills he supports, making them law. He vetoes a bill by returning it to the house in which it began, usually with a written message. Normally, bills he neither signs nor vetoes within 10 days become law without his signature.
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.