The Library of Congress "A Century of Lawmaking" has many historical Congressional Documents avaiable online including:
American State papers
United States Congressional Serial Set
Congressional hearings, reports and other documents 1970 - present
A Documentary History of the United States Constitution (S8.2: )
Congressional Record 1789 - present
Public papers of the Presidents (AE 1.114: )
Historical Census volumes in pdf format - original volumes in electronic format. 1790 through Census 2000. Print volumes of 1790 through 1990 are available in the Government Documents Collection.
Statistical Abstracts of the United States - 1878 through 2010 in pdf format. Historical Statistics of the United States 1789-1945 is also available here in pdf and Excel format.
Social Explorer - selected data from the 1790 to the present 1960 U.S. Censuses. User can create data maps and customized tables.
Susan B. Carter. Historical Statistics of the United States : Earliest Times to the Present. New York. Cambridge University Press. 2006. REF HA 202 H57 2006.
Statistics of Railways in the United States (ITC 1 ste 1: )
Reports of the Immigration Commission (J 21.2: )
Reports of the Womens Bureau (L 36.103: )
Survey of the Conditions of the Indians of the United States: Hearings before a Subcommittee of the Committee on Indian Affairs, United States Senate (microfilm)
Annual Report of the Commission to the Five Civilized Tribes 1895-1920 (microfilm)
National Security Archives - Georgetown University Collections of documents outlining U.S. Foreign Policy back to the Cold War
Foreign Relations of the United States (S 1.3: )
The Emerging Nation: a Documentary History of the Foreign Relations of the United States under the Articles of Confederation (AE 1.114/3:N 21)
Kapplers Indian Affairs : Laws and Treaties (Y 4.In 2/2 : L44)
Ratified Indian Treaties (microfilm)
League of Nations Treaties (microfilm)
United States Treaties and Other International Agreements 1776-1949 (S 9.12/2: )
United States Treaties and Other International Agreements 1949 - present (S 9.12: )
Documents on German Foreign Policy 1918 - 1945 (S 1.82: C/ vol. 1-13)
Nazi Conspiracy and Aggression : Office of the Chief Counsel for the Prosecution of Axis Criminality 1946 (W 1.2 : N 23)
Trials of War Criminals (D 102.8: )
Naval Documents of the American Revolution (D 207.12: )
Naval Documents Related to the United States Wars with the Barabary Powere 1805-1807 (W 45.1: )
Naval Documents Related to the Quasi-War between the United States and France 1797 - 1801 (W 45.5: )
Official Records of the Union and Confederate Navies in the War of Rebellion (W 45.5:
War of Rebellion: a Compilation of the Official Records of the Union and Confederate Armies (W 45.5: )
A Compilation of the Messages and Papers of the Confederacy: Including Diplomatic Correspondence 1861 - 1865 (Serial Set Volume 3265)
Journals of the Continental Congress 1784 - 1786 (LC 4.5: )
Papers of the Continental Congress 1774 - 1789 (microfim)
Territorial Papers of the United States (S 1.36: )
Texas Diplomatic Correspondence (SI 4.1: 1907 and 1908)
Last Updated: January 10, 2008
Papers of the Continental Congress. 1774-1789. 204 rolls of microfilm. Five volume index is located on top of the cabinet.
Foreign Letters of the Continental Congress and the Dept. of State. 1785-90. 1 roll of microfilm.
Domestic Letters of the Dept. of State. 1784-1906. 2 rolls.
Records of the Dept. of State Relating to Internal Affairs in Germany. 1910-1929.
United States Statutes at Large vol. 5 to 55. 75 rolls.
Minutes of the U.S. Supreme Court. 1790-1950. 41 rolls.
League of Nations Treaty Series. 1920-1925. Vol. 1-205. 38 rolls.
Saionji-Harada Memoirs. pt. 1-8. March 1930-Nov. 1940. 3 rolls.
British House of Commons Papers.
Federal Mortality Census Schedule. Colorado 1870 and 1880. 2 rolls
1870 - 1930 Population Census Schedules for Colorado Counties. 116 rolls.
U.S. Bureau of Indian Affairs. Miscellaneous Letters Sent by the Pueblo Indian Agency. 1874-1891. 10 rolls.
U.S. National Archives. Ratified Indian Treaties. 1894-1920. 1722-1869. 16 rolls.
Reports of the U.S. Superintendent for the Five Civilized Tribes. 1894-1920. 2 rolls.
U.S. Senate Committee on Indian Affairs. Survey of the Condition of the Indians of the United States. 1929-1944. 9 rolls.
Mexican Archives. 42 rolls.
Assessment Lists. Internal revenue Dept. 1862-1866. 3 rolls.
Colorado Territorial Papers, Interior Dept. Letters received Relating to the Penitentiary at Canon City, 1861-1876. 3 rolls.
Colorado Territorial Papers. State Dept. 1859-1874. 1 roll.
Correspondence of the Office of Explorations and surveys Concerning Isaac Stevens' Survey of a Northern Route for the Pacific Railway. 1853-1861. 1 roll.
Postmasters Record of Appointmentments. Coloraod Counties. 1832-1971. 4 rolls.
Historic American Buildings Survey. Colorado. 1 roll.
Sanborn Fire Insurance Maps. 1938-1974. 5 rolls.