27 December 2011 | Publisher: United States Bureau of Citizenship and Immigration Services | Document type: Thematic Guidelines
21 March 2009 | Publisher: United States Bureau of Citizenship and Immigration Services | Document type: Thematic Guidelines
9 July 1999 | Publisher: United States Bureau of Citizenship and Immigration Services | Document type: Query Responses
13 January 1999 | Publisher: United States Bureau of Citizenship and Immigration Services | Document type: Query Responses