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The Record Group Explorer allows you to browse each National Archives Record Group by file format, including photographs, textual records, maps and charts, electronic, and audiovisual records. Click on a Record Group of interest, and use the “Browse our Records” section to find links to records within that Record Group, organized by file format. You can see photographs from the Tennessee Valley Authority by navigating to Record Group 142 in the Record Group Explorer. Each file format links to records available online in the National Archives Catalog. Learn more about the Record Group Explorer.