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United States Statutes at Large
Starting with the volume for P.L. 88-1 (1963), a brief "Guide to Legislative History" appears in a table near the end of the volume, including citations for bills, committee reports and Congressional Record consideration dates.
Beginning with P.L. 94-1 (1975) the legislative history citations appear immediately following each law rather than in a separate table.
U.S. Code Congressional & Administrative News can be used from 1966 forward to identify the committee reports.