Congressional Information Service
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CIS Index to Unpublished U.S. Senate Committee Hearings
CIS Index to Unpublished U.S. Senate Committee Hearings makes available to researchers Senate committee hearings that were never published, but were transferred to the National Archives and closed to public access. Senate unpublished hearings generally remain closed for 20 years, but hearings that contain classified or sensitive material generally remain closed for 50 years.
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