1989 - Present
Congress.gov. The full texts of bills are available from 1989 (101st Congress)-present. Bill records (but not the full text) are available from 1973 (93rd Congress) to the present.
govinfo. The full texts of bills are available from 1993 (103rd Congress)-present.
1973 - 1989
House and Senate Bills on microfiche arranged by Congress, 96th-106th Congress (1979-1980-1999/2000). (Microform collection,1st floor RBD Library Y1.4/nos)
Index: Final Cumulative Finding Aid, House and Senate Bills. (Closed Stacks, GP 3.28:)
1799 - 1875
Congress.gov. The full texts of bills and resolutions are available from 1799-1875 (the 6th to 42nd Congresses).
United States Statutes at Large
Congresses 81-112 (1951-2011) govinfo
Congresses 1-80 (1789-1950) Law Library of Congress