The Congressional Record is the official record of the proceedings and the debates of the United States Congress.
The text of House and Senate floor debate by legislators on specific bills is found in the Congressional Record.
Statements by a bill's sponsor or by the chair of a relevant committee can be useful in understanding a bill.
About the Congressional Record, provided by Congress.gov, is very informative.
Congressional Record 1977--2008 can be found in the Library's Microfiche Collection.
In the U.S. Congressional Documents Collection:
Congressional Record Bound and Daily Versions 1980 -
Also, the three predecessor titles: Annals of Congress (1789-1824), Register of Debates (1824-1837) Congressional Globe (1833-1873),
FDsys: Congressional Record 1994 -
Library of Congress Annals of Congress 1789-1824
Library of Congress Register of Debates 1824-1837
Library of Congress Congressional Globe 1873-1875