ARRANGEMENT BY AUTHOR'S LAST NAME: U 

• Underwood, Horace H. Occidental Literature on Korea, Transactions of the Korea Branch of the Royal Asiatic Society, Vol. XX (1931), pp. 1-186,i-xvi.
  
  Underwood, L. H. Fifteen Years Among the Top-Knots or Life in Korea. Boston: American Tract Society, 1904. [.pdf format]   (A Google book)
  
  
• United States. Air Force. United States Air Force Operations in the Korean Conflict, 25 June-1 November 1950.Maxwell Air Force Base, Alabama?: USAF Historical Division, 1952.  [.pdf format]
  
  
• United States. Air Force. USAF Credits for the Destruction of Enemy Aircraft Korean War. Maxwell Air Force Base, Alabama: Air University, 1963.  [.pdf format]
  
  
• United States. Army. Extract of Interim Historical Report, Korea War Crimes Division: Cumulative to 30 June, 1953. N.p.: N.n., 1953. (12161 KB) [.pdf format]
  
  
• United States. Army. The Handling of Prisoners of War During the Korean Conflict (u). Washington, D.C.: Military History Office, 1960  [.pdf format]
  
  
• United States. Army. Korea: 1950. Washington: Center of Military History, 1997. [.pdf format]
  
  
• United States. Army. Korean War Medal of Honor Recipients. Washington: U.S. Army, 2000? [MS Reader format]
  
  
• United States. Army. No Gun Ri Review. Washington:  Inspectorate General, 2001 [.pdf format]
  
  
• United States. Central Intelligence Agency. Chinese Communist Intervention in Korea. Washington, D.C.: CIA., 24 November 1950.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Communist Capabilities in South Korea Washington, D.C.: CIA., 21 February 1949.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Consequences of US Troop Withdrawal from Korea in Spring, 1949.Washington, D.C.: CIA., 28 February 1949.  [.pdf format]
  
  
• United States. Central Intelligence Agency. International Implications of Maintaining a Beachhead in South Korea.Washington, D.C.: CIA., 11 January 1951.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Military Indications of a Possible Large-Scale Communist Attack in Korea in the Immediate Future. Washington, D.C.: CIA., 28 April 1952.  [.pdf format]
  
  
• United States. Central Intelligence Agency. The Likelihood of Major Hostilities in Korea. Washington, D.C.: CIA., 16 May 1968.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Possible Communist Objectives in Proposing a Cease Fire in KoreaWashington, D.C.: CIA., 6 July 1951.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Prospects for the Survival of the Republic of Korea. Washington, D.C.: CIA., 28 October 1948.  [.pdf format]
  
  
• United States. Central Intelligence Agency. The Situation in Korea. Washington, D.C.: Central Intelligence group 1947. [.pdf format]
  
  
• United States. Central Intelligence Agency. Study of CIA Reporting on Chinese Communist Intervention in the Korean War, September-December 1950. Washington, D.C.: CIA., October, 1955.  [.pdf format]
  
  
• United States. Central Intelligence Agency. Threat of Full Chinese Communist Internvention in Korea. Washington, D.C.: CIA., 12 October 1950.  [.pdf format]
  
  
• U.S. Department of Commerce, Office of Technology Policy. Korea's Strategy for Leadership in Research and Development. Washington, D.C.: Department of Commerce, 1997. [MS Reader format] 
  
  
• United States. Department of States. 2008 Human Rights Report: Republic of Korea.  Washington: Department of State, 2009. 
  
  
• U.S. Department of State. Armistice in Korea: Selected Statements and Documents. Washington, D.C.: Department of State, 1953. [.pdf format]
  
  
• U.S. Department of State. Guide to the U.N. in Korea. Washington, D.C.  Department of State, 1951[.pdf format ]
  
  
• U.S. Department of State. "Korea". Foreign Relations of the United State, 1961-1963. Volume XXII: China; Korea; Japan. Washington, D.C.: Department of State, 1996. [MS Reader format]
  
  
• United States. Department of State. Korea, Republic of: Country Reports on Human Rights Practices 2007. Washington: Department of State, 2008. (285 KB)  [.pdf format]
  
  
• U.S. Department of State, Bureau of East Asian and Pacific Affairs. Background Notes: Korea. Washington, D.C.: Department of State, 2000. [MS Reader format]
  
  
• United States. Foreign Broadcast Information Service. "Communist Invasion Triggers Korean War," in 30 Years of the Foreign Broadcast Information Service, 1941-1971.  (Washington, D.C.: FBIS, 1971), pp. 6-8. (1793 KB) [.pdf format]
  
  
• United States. House of Representatives. The Security Situation on the Korean Peninsula. Washington, D.C.: U.S. Government Printing Office, 1994.
  
  
• United States. House of Representatives. Tensions on the Korean Peninsula. Washington, D.C.: U.S. Government Printing Office, 1994.
  
  
• United States. Library of Congress. Country Profile: South Korea.  Washington, D.C.: Library of Congress., 2005. [.pdf format]
  
  
• United States. United States Information Agency. In the Common Interest. Washington: U.S. Information Service, 1955. (12793 KB) [.pdf format] 
  
  
• United States. United States Trade Representative. 2005 National Trade Estimate Report on Korea Trade Barriers. Washington, D.C.:United States Trade Representative, 2005. 
  
  
• Utz, Curtis A. Assault from the Sea:  the Amphibious Landing at Inchon.  Washington, D.C.: Naval History Center, 1994.  [.pdf format]