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You can access the Congressional Record, the official record of the proceedings on the floor of the full House and Senate (1873 - Present), online here: Congressional Record (Bound Edition). The PDFs are arranged by date range. If you're searching by subject or legislation, I suggest selecting a date range toward the end of the volume and locate the PDF that contains the index.
The Congressional Record is also digitized and searchable through a subscription database called HEIN Online, available at most law and academic libraries. For more recent proceedings, you can access the Congressional Record through Congress.gov.
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