The most comprehensive resource is Congressional Publications, which includes Legislative Histories from 1969 to the present. The citation lists include bills, prints, hearings, reports, debates, signing statements, and many of these documents can be accessed online directly from the citation.
These sources are not comprehensive!
The Congressional Record is the official record of the proceedings and debates of the United States Congress. It is published daily when Congress is in session (Daily Edition.) At the end of each session of Congress, all of the daily editions are collected, re-paginated, and re-indexed into a permanent, bound edition (Bound Edition). There are four sections in the daily edition and the page numbers start with the letter from each section, i.e., H=House, S=Senate, E=Extension of Remarks, and D=Daily Digest. Pagination in the bound edition runs from the beginning to the end of each session. The Congressional Record is also available in print, Alexander DOCLAW-US, stacks 32-36.
Print: Public Papers of the Presidents of the United States-Alexander DOCUS -- GS 4.113
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