Congressional Quarterly Almanac Plus
Yearly publication which provides information on every major piece of legislation to pass through Congress from that particular year. Includes both bills that became laws and ones that did not.
The U.S. Congress Votes Database
Contains "every vote in the U.S. Congress since 1991." Browse by Congress or by member of Congress.
Encyclopedia of the American Constitution
Four-volume encyclopedia providing definitions of terms, articles on constitutional history and political issues, biographies of important people,
information on court cases, and much more