This box includes some of the census publications about the African American population 1900-1940. For a much more complete list of titles and links, see the excellent LibGuide, Negro, Black and African American Census Reports, created by Sandy Schiefer of the University of Missouri here.
ProQuest Congressional is a comprehensive database that searches across current and historical documents of the United States Congress, many of which are included in full text. It includes the U.S. Serial Set (the published working papers of Congress), Congressional Hearings, the Congressional Record (through 1997) and hundreds of thousands of House and Senate reports, State of the Union messages, Congressional journals, hearings, high-resolution maps, and more.
Access has recently been expanded to include ProQuest Congressional Hearings Digital Collection Historical Archive Parts B and C (1980-2010), ProQuest Congressional Record Permanent Digital Collection, and ProQuest U.S. Serial Set 2 Parts G, H, and I.