Columbia subject headings:
United States--Politics and government--Sources--Bibliography--Catalogs.
United States. Congress. Senate--Records and correspondence--Catalogs.
United States. National Archives and Records Administration--Catalogs.
Harvard subject headings:
United States--Politics and government--Archival resources.
United States--Politics and government--Sources--Bibliography--Catalogs.
United States. Congress. Senate--Archives--Catalogs.
United States. Congress. Senate--Records and correspondence.
United States. National Archives and Records Administration--Catalogs.
United States. National Archives and Records Administration.
Princeton subject headings:
United States--Politics and government--Sources--Bibliography--Catalogs.
United States. Congress. Senate--Records and correspondence--Catalogs.
United States. National Archives and Records Administration--Catalogs.