override of a veto - The process by which each chamber of Congress votes on a bill vetoed by the President. To pass a bill over the President's objections requires a two-thirds vote in each Chamber. Historically, Congress has overridden fewer than ten percent of all presidential vetoes.
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.