"The history of the U.S. Congress is documented in the official records of Congress, the private and personal papers of members of Congress, and many other sources. Official records and some personal papers are located in the National Archives at the Center for Legislative Archives, but most personal papers are geographically dispersed in repositories around the country. The best printed sources for locating congressional papers are:
- Guide to Research Collections of Former Members of the United States House of Representatives, 1789-1987
- Guide to Research Collections of Former United States Senators, 1789-1995"