The U.S. Serial Set include Congressional House & Senate Documents and Reports beginning in 1817. Prior publications appeared in it's predecessor publication, the American State Papers (ASP). Many publications from federal agencies on a wide range of topics were also published as Congressional documents.
American State Papers are included in the ProQuest U.S. Serial Set database subscription. Some other sites where you may locate materials in the ASP are:
American State Papers from the American Memory Project, Library of Congress, 1789-1838 (39 volumes)
The Serial Set includes various non-governmental publications, such as the annual reports of the Boys Scouts and Girl Scouts of America, the Smithsonian Institution, and the Daughters of the American Revolution. It also includes the proceedings of the national convention of the American Legion along with the proceedings of the Veterans of Foreign Wars (VFW) conventions. These reports and proceedings were included as Congressional Documents.