M-623 (Rev. 03/09. These flash cards will help immigrants learn about U.S. history and government while preparing for the new naturalization test. These flash cards can also be used in the classroom as an instructional tool for citizenship preparation. 104 cards printed on both sides, sold as a set. Publisher Homeland Security Dept., United States Citizenship and Immigration Service, Office of Citizenship - Year/pages 2009: Box of 104 cards; ill. - English