Bills and resolutions beginning with the 101st Congress (1989-1990) may be found on Congress.gov. Ways of accessing legislation on Congress.gov are described at the Congress.gov How To Pick a Search page.
Bills and resolutions prior to 1873 are selectively available from the Century of Lawmaking project of the Library of Congress.
Bills and resolutions have also been digitized and made part of Proquest Congressional and Proquest Legislative Insight databases which are available on Library of Congress computers.
Bills and resolutions are available in print and microform at the Law Library of Congress, and are selectively available at other libraries throughout the country, including some Federal Depository Libraries.